The plaintiff was found guilty of a misdemeanor by a justice of the peace, who assessed a fine against him of $50, and, upon a refusal to pay, committed him. To obtain his liberty, he has presented this petition for a writ of habeas corpus.'
The offense charged consisted of employing one William EEooley in underground mining more that eight hours *81per day, in violation of a law entitled “An act regulating the hours of employment in underground mines, and in smelting and ore reduction works,” as follows:
’ “Section 1. The period of employment of working men in all underground mines or workings shall be eight (8) hours per day, except in oases of emergency where life or property is in imminent danger.
“See. 2. The period of employment of workingmen in smelters and all other institutions for the reduction or refining of ores or metals shall be eight (8) hours per day, except in cases of emergency where life or property is in imminent danger.
“Sec. 8. Any person, body corporate, agent, manager or employer, who shall violate any of the provisions of sections 1 and 2 of this act, shall be deemed guilty of a misdemeanor.”
This statute limits the hours of employment of laboring men in underground mines and smelters, or other works for the reduction of ores or refining of metals, to eight hours per day.
The question for our consideration and decision is, had the legislature the power to enact this law?
Article 16 of the constitution of this state is as follows (Laws Utah 1896, p. 219):
“Section 1. The rights of labor shall have just protection through the law's calculated to promote the industrial welfare of the state.
“Sec. 2. The legislature shall provide, by law, for a board of labor, conciliation and arbitration which shall fairly represent the interests of both capital and labor. The board shall perform duties, and receive compensation as prescribed by law.
“Sec. 3. The legislature shall prohibit: (1) The employment of women, or of children under the age of four*82teen years, in underground mines. (2) The contracting of convict labor. (3) The labor of convicts outside prison grounds, except on public works under the direct control of the state. (4) The political and commercial control of employés.
“Sec. 4. The exchange of blacklists by railroad companies, or other corporations, associations or persons is prohibited.
“Sec. 5. The right of action to recover damages for injuries resulting in death shall never be abrogated, and the amount recoverable shall not be subject to any statutory limitation.
“Sec. 6. Eight hours shall constitute a day’s work on all works or undertakings carried on or aided by the state, county or municipal governments; and the legislature shall pass laws to provide for the health and safety of employés in factories, smelters and mines.
“Sec. 7. The legislature, by approproate legislation, shall provide for the enforcement of the provisions of this article.”
The first section of the act makes it the duty of the legislature to protect the rights of laboring men by the enactment of just laws calculated to promote the indus-ti’ial welfare of the people, — such laws as will be just to all classes. The command is to the lawmaking department of .the state, and the only express limitations upon the power are that such laws shall be just, and calculated to promote the welfare of the industrial classes. The legislature must decide whether the law is just and adapted to the purpose named; and unless the law is so palpably unjust, or so clearly not calculated to promote the purposes mentioned in the constitution, as to remove every reasonable-doubt that it is unjust, or that it is not calculated to promote the purpose expressed in the con*83stitution, the court should not hold it without the scope of the authority mentioned in that instrument. The first clause of section -6 declares that “eight hours shall constitute a day’s work on all works or undertakings carried on or aided by the state, county or municipal government.” We presume the object of this provision was to protect the laboring man from the' injurious consequences of prolonged physical effort, and to give him the remainder of the 24 hours for his own personal affairs, and for the cultivation of his mental and moral powers, the acquisition of useful knowledge, and for rest and sleep. The second clause of the section commands the legislature to pass laws “for the health and safety of employés in factories, smelters and mines.” This provision must be regarded as an expression of the will of the people of the state with respect to the subjects and objects of legislation named in it; and they possessed all the power to enact laws with respect .to such, subjects that the people of the United States had not conferred in the national constitution exclusively on that government. Any law adapted to the preservation of the health or safety of employés in factories, smelters, or mines is within the scope of this provision. The law must be connected with some of the objects named, and calculated to effect that purpose. If it is not so connected and adapted, the -court has the right to hold that it is not within the scope of the provision. But, if there is a reasonable doubt as to the connection and adaptation, the advisability must be held by the court to have been with the lawmaking power. The court must be able to see clearly that the law was not so connected before holding it void for that reason. If the power to pass the'law is conceded, the court cannot set it aside because it may deem its enactment unnecessary or injudicious, or because the court may think that experience has proven it so, or *84because tbe court may think itself more sagacious than the legislature, and can therefore see more clearly that the law will retard rather than promote progress and prosperity, and will be a detriment to the common good when actually applied to human affairs amid the conditions of the future.
This brings us to the question: Is the first section of the statute limiting the period of employment of laboring men in underground mines to eight hours per day, except in cases of emergency, where life or property is in imminent danger, calculated to protect the health of such laboring men? The effort necessary to successful mining, if performed upon the surface of the earth, in pure air, and in the sunlight, prolonged beyond eight hours, might not be injurious, nor affect the health of able-bodied men. When so extended beneath the surface, in atmosphere laden with gas, and sometimes with smoke, away from the sunlight, it might injuriously affect the health of such persons. It is necessary to use artificial means to supply pure air to men laboring in any considerable distance from the surface. That being so, it is reasonable tp assume that the air introduced, when mixed with the impure air beneath the surface, is not as healthful as the free air upon the surface. The fact must be conceded that the breathing of pure air is wholesome, and the breathing of impure air is unwholesome. We cannot say that this law, limiting the period of labor in underground mines to eight hours each day, is not calculated to px’o-mote health; that it is not adapted to the protection of the health of the class of men who work in underground mines.
While the provision of the constitution under consideration makes it the duty of the legislature to enact laws to protect the health and to secure the safety of men working in underground mines, and in factories and *85smelters, it does not prohibit tbe legislature from enacting other laws affecting such classes, to promote the general welfare. While the constitution of the United States is a delegation of powers to that government, with some express limitations upon the powers conferred, it also contains limitations upon the powers of the states. The government which it created is regarded ,as one of enumerated and delegated powers. On the other hand, while the state constitution contains some mandatory provisions, with others, distinguishing the departments of the government, and specifying the duties of various officers thereof, it contains many limitations upon the state, and is regarded in a general sense as a limitation upon the state government. The authority of the general government is ascertained from the powers delegated, while those of the state government are ascertained from those not prohibited. The powers of the first are described by those delegated, and the powers of the latter consist of those not prohibited. This leaves the state legislature in the possession of all the lawmaking power not prohibited to it by the constitution of the United States, or the laws made in pursuance of it, or by the state constitution. The enactment of some laws is made mandatory. The enactment of others is left to the discretion of the legislature, as the public welfare may demand. Among the mandatory provisions of the constitution of this state is the one under consideration.
It is claimed that the enactment of the statute in question was forbidden by section 7 of article 1 of the constitution of the state, which is that “no person shall be deprived of life, liberty or property without due process of law.” The petitioner insists that his trial was not, and that his imprisonment is not, according to “the law of the land,” because the statute fixing the period of labor of a laboring man in underground mines was, as he claims, *86forbidden by tbe constitution, and therefore void. If tbe legislature bad power to pass tbe law, there was no valid objection to bis trial, ñne and imprisonment. If tbe law was valid, tbe usual and ordinary process was adopted. If it was not valid, tbe defendant was deprived of bis liberty without due process of law. It is also insisted that tbe provisions of tbe state law were forbidden by section 1 of amendment 14 of the constitution of the United States, as follows: “All persons born or naturalized in tbe United States, and subject to tbe jurisdiction thereof, are citizens of the United States, and of tbe state wherein they reside. No state shall make or enforce any law which shall abridge tbe privileges or immunities of citizens of tbe United States; nor shall any state deprive any person of life, liberty or property without due process of law, nor deny to any person within its jurisdiction tbe equal protection of tbe law.” This section declares: (1) That all persons born or naturalized in tbe United States and subject to tbe jurisdiction thereof, are citizens of tbe United States and of tbe state wherein they reside. They are made citizens of two distinct governments. (2) It declares that “no state shall make or enforce any law which shall abridge the privileges or immunities of citizens of tbe United States.” The enactment of state laws depriving or abridging tbe privileges or immunities of citizens of tbe state is left to tbe state legislature so far as this provision goes. It secures to citizens of tbe United States, in any state, privileges and immunities of tbe citizens of that state. Expounding tbe provision now under consideration, tbe supreme court of tbe United States said: “Tbe constitutional provision there alluded to did not create those rights which it called ‘privileges’ and ‘immunities’ of citizens of the state. It threw around them in that clause no security for tbe citizen of tbe state in which they were claimed and exercised; nor did it pro*87fess to control tlie power of the state government over the rights of its own citizens. Its sole purpose was to declare to the several states that ‘whatever those rights, as you grant or establish them to your own citizens, or as you limit or qualify or impose restrictions on their exercise, the same, neither more or less, shall be the measure of the rights of citizens of other states within your jurisdiction.’ ” Slaughterhouse Cases, 16 Wall. 76. As the plaintiff is a citizen of this state, the second clause of the first section last above quoted has no bearing upon his case, as his privileges and immunities must be ascertained from the constitution of the state and its laws. The third clause of the section declares that no state shall “deprive any person of life, liberty or property without due process of law.” This, in effect, is the same as section 7 of article 1, of the state constitution, and means process authorized by the law of the land. And, as we have seen, if the state law which the plaintiff was charged with violating was valid, — if the legislature had power to pass it, — there was no substantial objection to the process. It was suitable and proper to the nature of the case, and sanctioned by the established usages of the courts.
The last clause of section 1 of amendment 14 of the federal constitution declares that no state shall “deny to any person within its jurisdiction the equal protection of the laws.” The slaves in the vaiious states in which slavery existed having been liberated during the late war, congress deemed it necessary to make them citizens of the United States, and forbade the states the denial to them the equal protection of the law. At that time the laws of all the states in terms gave equal protection to all white persons. This amendment, however, is general, and forbids the denial to any class of persons the equal protection of the laws, by any state; and we have no doubt that class legislation is forbidden. But some pur*88suits are attended with, peculiar hazards and perils, the injurious consequences from which may be largely prevented by precautionary means, and laws may be passed calculated to protect the classes of people engaged in such pursuits. It is not necessary to extend the protection to persons engaged in other pursuits not attended with similar dangers. To' them the law would be inappropriate and idle. So, if underground mining is attended with dangers peculiar to it, laws adapted to the protection of such miners from such danger should be confined to that class of mining, and should not include other employments not subject to them. And if men engaged in underground mining are liable to be injured in their health, or otherwise, by too many hours’ labor each day, a law to protect them should be aimed at that peculiar wrong. In this way, laws are enacted to protect people from perils from the operation of railroads, by requiring bells to be rung and whistles sounded at road crossings, and the slacking of the speed of the trains in cities. So, the sale of liquor is regulated to lessen the evils of the liquor traffic, and other classes of business are regulated by appropriate laws. In this way, laws are designed and adapted to the peculiarities attending each class of business. By such laws, different classes of people are protected by various acts and provisions. In this way, various classes of business are regulated, and the people protected, by appropriate laws, from dangers and evils that beset them; safety is secured, health preserved, and the happiness and welfare of humanity promoted. All persons engaged in business that may be attended with peculiar injury to health or otherwise, if not regulated and controlled, should be subject to the same law; otherwise, the law should be adapted to the special circumstances. The purpose of such laws, is not advantage to any person or class of persons, or disadvantage to any *89person or class of persons. Necessary and just protection is tlie sole object.
An ordinance of tbe city and county of San Francisco prohibited the washing and ironing of clothes in public laundries and washhouses within certain prescribed limits of the city and county from 10 o’clock at night until 6 o’clock on the morning of the following day; and one Soon Hing was fined and imprisoned for a violation of it, and he petitioned for a writ of habeas corpus, on the ground that the ordinance was void, because it discriminated between the class of laborers engaged in the laundry business and- those engaged in other kinds of business; that it discriminated between laborers beyond the designated limits and those within them; that it deprived the petitioner of the right to labor, and, as a necessary consequence, of the right to acquire property; and that the board had no power to pass it. The writ was denied by the lower court, and the judgment was brought before the supreme court of the United States, and affirmed by that court. Among other things, that court said, in its opinion: “The specific regulations for one kind of business, which may be necessary for the protection of the public, can never be the just ground of complaint because like restrictions are not imposed upon other business of a different kind. The discriminations which are open to objection are those where persons engaged in the same business are subject to different restrictions, or are held entitled to different privileges under the same conditions. It is only then that the discriminations can be said to impair that equal right which all can claim in the enforcement of the laws.” Soon Hing v. Crowley, 113 U. S. 703; Barbier v. Conolly, 113 U. S. 27.
Our attention has been directed to the rule by which the court should be governed in deciding upon the constitutionality of the law in question, and reference is *90made to the case of Dartmouth College v. Woodward, 4 Wheat. 629, wherein Chief Justice Marshall, in delivering the opinion of the court, said “that in no doubtful case would it [the court] pronounce a legislative act to be contrary to the constitution.” In the Sinking Fund Cases the same court said: “Every possible presumption is in favor of the validity of a statute, and this continues until the contrary is shown beyond a rational doubt. One branch of the government cannot encroach on the domain of another without danger. The safety of our institutions depends in no small degree on a strict observance of this statutory rule.” 99 U. S. 700; Powell v. Pennsylvania, 127 U. S. 678. In this last case the constitutionality of a statute of Pennsylvania, prohibiting the manufacture or sale, or offering for sale, or having in possession with intent to sell, oleomargarine butter, was questioned. No evidence was offered on the trial in the court even to prove that the oleomargarine was impure or unwholesome. On the contrary, there was an offer to prove that it was a wholesome and nutritious article of food, in all respects as wholesome as butter, produced from pure unadulterated milk, or cream from unadulterated milk. The court held that whether the manufacture of oleomargarine of the kind described in the statute involved such danger to the public health as to require, for the protection of the people, the entire suppression of the business, rather than its regulation in such manner as to permit its’ manufacture and sale to go on, were questions of fact and of public policy which belonged to the legislative department to determine, and that the court could not interfere without usurping powers committed to the legislative department. The case of People v. Warden of City Prison held the enactment of a law prohibiting any person from exercising the calling of a master plumber without passing an examination, be*91fore a board of examiners, a valid exercise of the police power. In its opinion, the court further held that, if legislation is calculated to protect the public health and promote the public comfort and safety, the exercise of the legislative discretion is not the only subject of judicial review, but those measures must have some relation to those ends. 144 N. Y. App. 529.
We have examined a number of authorities to which reference has been made, and those which we deem most pertinent to the case in hand we will further examine in this opinion. Judge Cooley says: “Whether a statute is constitutional or not is always a question of power; that is, a question whether the legislature, in the particular case, in respect to the subject matter of the act, the manner in which its object is to be accomplished, and the mode of enacting it, has kept within the constitutional limits, and observed the constitutional conditions. In any case in which this question is answered in the affirmative, the courts are not at liberty to inquire into the proper exercise of the power. We must assume that legislative discretion has been properly exercised.'’ Cooley, Const. Lim. (Cth Ed.) p. 220.' The same author says, at pages 200 and 201, “that except where the constitution has imposed limits upon the legislative power, it must be considered as practically absolute, whether it operate according to natural justice or not in any particular case.” Undoubtedly, sovereignty resides in the people, and their will is expressed in constitutions and laws, — in constitutions in the mode prescribed, and in statutes through the legislature; and, if the law is in harmony with the federal and state constitutions, it must stand until the lawmaking power changes it. It is the duty of the court to interpret, construe, expound, and apply the law, whether it be expressed in constitutions or in statutes, or whether it be the common law. But *92courts bave not been intrusted, with tbe lawmaking power. That power is in the hands of another department of government. The supreme court of Massachusetts, in the case of Com. v. Hamilton Manfg Co., held that a law declaring that a woman should not be employed at labor by any person, firm, or corporation in any manufacturing establishment more than 10 hours in any one day, except in certain cases, and in no cases more than 60 hours a week, was constitutional and valid. In deciding the point, the court said: “It does not forbid any person, firm, or corporation from employing as many persons or as much labor as such person, firm, or corporation may desire; not does it forbid any person to work as many hours a day or week as he chooses. It merely provides that, in an employment which the legislature has evidently deemed to some extent dangerous to health, no woman shall be engaged in labor more than ten hours a day or sixty hours a week. There can be no doubt that such legislation can be maintained, either as a health or police regulation, if it were necessary to resort to either of these sources for power. This principle has been so frequently recognized in this commonwealth that reference to the decisions is unnecessary.” 120 Mass. 383.
In the case of Ritchie v. People, 155 Ill. 98, the following provision of a statute of that state was held unconstitutional and void: “No female shall be employed in any factory or workshop more than eight hours in any one day, or forty-eight hours in any one week.” Act June 17, 1893, § 5. In deciding upon the law, the court said that the police power of the state enables it to promote the health, comfort, safety, and welfare of society, and that it was very broad and far-reaching, but that it was not without its limitations; that “legislative acts passed in- pursuance of it must not be *93in conflict with, the constitution, and must have some relation to tlie ends sought to be accomplished, — that is to say, to the comfort, welfare, or safety of society.” And, further on, the court also said: “But the police power of the state can only be permitted to limit or abridge such a fundamental right, as the right to make contracts, when the exercise of such power is necessary to promote the health, comfort, welfare, and safety of society or the public.” Just preceding the statement of this proposition, reference is made to an inference, and to a natural law: “There is no reasonable ground — at least, none which has been made manifest to us in the argument of counsel — for fixing upon eight hours in one day as the limit within Avhich woman can work without injury to her physique, and beyond which, if she works, injury will necessarily follow.” The court assumed a very wide discretion in passing upon the reasonableness and appropriateness of the law, which is pronounced absolutely void. In Frorer v. People, 141 Ill. 171, the court held a statute unconstitutional which made it unlawful for any natural or legal ' person, while in the business of mining or manufacturing, to engage or be interested in keeping or controlling any truck store, shop, or scheme for the furnishing of supplies, tools, clothing, provisions, or groceries to employés. The court said in its opinion that, “in all that relates to mining and manufacturing wherein they differ from other branches of industry, we recognize the supremacy of the general assembly to determine whether any, and, if any, what, statutes shall be enacted for their welfare,'and that of operatives therein, and necessarily affecting them alone, But keeping stores and groceries or supplies of tools, clothing, and food, by whatever name, to sell to laborers in mines and manu-factories, is entirely independent of mining and manufacturing.” And said, further, that it did not regulate *94tlie duties oí employer and employé in respect to mining; that it imposed disabilities as to contracting as to tools, clothing, and food, matters as to which all laborers in every other branch of industry are permitted to contract without any restriction. The principal objection to the law was that it was unequal. The court said that it was impossible, under the police power, that what is lawful •if done by A, if done by B can be a misdemeanor, the circumstances and conditions being the same. A law of the state of New York to improve the public health by prohibiting the manufacture of cigars and the preparation of tobacco in tenement houses in certain cases was held unconstitutional by the court of appeals. While the act professed to be a health law, the court was of the opinion that it was not. The court said: “It is plain that this is not a health law, and that it has no relation to the public health,” — 'and for that reason held it of no effect. In re Jacobs, 98 N. Y. 98.
We do not agree with defendant’s counsel that the business of mining is affected with a public interest, and the legislature had the power to' pass the law for that reason. Mines are used by private persons or corporations, who have the exclusive use and control of them, as a farmer may own his farm, and have the exclusive use and control of it. The fact that the business may benefit the public does not give the public any interest in the mine or its business, or affect it with a public interest. It is not like the railroad business. Such property and business are owned by a private corporation, but the use of the road is in the public. Travelers and shippers have a common right to use the road for such purposes, by paying fares or freights. The same may be said of similar other classes of business affected with a public use and interest. On this point the court said, in the last-cited case: “Although the legislature may declare *95it to. be public, that does not necessarily determine its character. It must, in fact, be public; and, if it be not, no legislative fiat can make it so.” In re Townsend, 39 N. Y. 171; In re Deansville Cemetery Ass’n, 66 N. Y. 569; In re Eureka Basin Warehouse & Manufg Co., 96 N. Y. 42; Rockwell v. Nearing, 35 N. Y. 302.
But while the business of mining may not be affected with a public interest, the legislature may enact laws adapted to the promotion of the health and safety of men working in underground mines. Whatever difference of opinion may exist as to the extent and boundaries of the police power, and however difficult it may be to render a satisfactory definition of it, there seems to be no doubt that it does exist to the protection of the lives, health, and property of the citizens, and to the preservation of good order and the public good. The legislature cannot, by any contract, divert itself of the power to provide for these objects. They belong emphatically to that class of objects which demand the application- of the maxim, “Solus populi suprema leer,” and they are to be attained and provided for by such appropriate means- as the legislative discretion may devise. That discretion can no more be bargained away than the power itself. Beer Co. v. Massachusetts, 97 U. S. 25.
The section of the statute whose constitutionality is involved in this oas-e includes all employés and employers engaged in working underground mines. None are omitted who may be subject to the peculiar conditions that attend such mining. The provision of the state constitution quoted makes it the duty of the legislature to “pass laws to provide for the health and safety of employés -in factories, smelters and mines.” And we are not authorized to hold that the law in question is not calculated and adapted in any degree to promote the health and safety of persons working in mines and smelt*96ers. Were we to do s'o, and declare it void, we would usurp the powers intrusted by the constitution to the lawmaking power. The discharge of the- petitioner is denied, and he is remanded to- the custody of the sheriff named, until discharged according to law.
BaktCH and Menee, JJ.: In concurring in this opinion we do not wish to be understood as concurring in that part of it wherein it is stated: “We do not agree with defendant’s counsel that the business of mining is' affected with a public interest, and the legislature had the power to pass the law for that reason;” “that the business of mining is not affected with a public interest;” or that the public have no interest in mining, etc. To this part of the opinion we withhold our assent. The question is too important to be passed upon without full argument and investigation.