The decree brought up for review by this appeal, as one settling the principles of the cause, is predicated, for the most part, on an amended bill to which a demurrer was interposed on the ground that the matter set up in it constituted a departure from the original bill and the further ground that such matter constituted a cause of action set up in an action of as-sumpsit previously instituted against the defendant and pending at the date of the amendment. Other incidental or collateral allegations thereof were relied upon as grounds of demurrer. There was also a demurrer to the original bill. Overruling the demurrers, at the hearing on answers, replications and evidence, the court entered a decree affirming the right of the plaintiff to the relief sought and referred the cause to a commissioner for the taking of an account.
The litigation involves claims and contentions respecting *8title to the coal in a tract of land and mining rights therein. On the original bill, a temporary injunction was sought and obtained, inhibiting, restraining and enjoining the defendant from mining the coal. At or about the date of the filing of that bill and the award of the injunction thereon, the plaintiff instituted an action of assumpsit for the recovery of the value of coal mined, removed and sold. About seven months later, the defendant moved the court for a modification of the injunction order, permitting it to enter the mines and remove therefrom the rails, spikes, ties, electric wires and other property it had placed and installed therein for mining purposes. At the same time, the plaintiffs tendered and were permitted to file the amended bill and the defendant filed its demurrer thereto. The motion was overruled and the cause continued, but the plaintiffs were required to execute an injunction bond in the penalty of $2,000.00, in addition to the bond previously given in the penalty of $1,000.00. Answers to both the original and amended bills were filed, depositions taken, the cause submitted upon the bills, answers, replications, motions to modify the injunction and to' dissolve it and depositions taken and filed by both parties, and decree entered as above stated.
Sufficiency of the original bill is apparent, and it may be conceded in the argument submitted, which is general and does not seem to be limited in any instance to 'that bill standing alone. The bill alleges perfect and complete title in the plaintiffs and a mere verbal license in the defendant, to mine coal from the property, and revocation of such license, in conformity with the agreement under which it was granted. It then alleges that, notwithstanding the revocation, the defendant had continued its mining operations in the land. All of these facts, the demurrer concedes for its purposes, and no authority need be cited for the elementary and universally recognized proposition that equity will enjoin acts of trespass, working in-' jury to the inheritance, and destruction thereof. In such cases, the legal remedy is wholly inadequate. .
In so far as the demurrer to the amended bill is based upon the theory of a departure from the original bill or the making of a new case, it was properly overruled. The purposes of the two bills are closely allied. They pertain to the same general *9subject matter. Each seeks vindication of the right of the plaintiffs to the coal in the particular tract of land in question. The original bill invokes a measure of protection against the severance and removal thereof. Its purpose is conservation and preservation of the remaining rights of the plaintiffs. The amended bill pursues the same general purpose. It seeks compensation for the coal already taken out. Both pleadings have the same basis or foundation, the right of the plaintiffs to the coal in question. The rule against departure in equity pleading does not preclude jhe introduction of a new cause of action in the technical sense of the term. Stated with fair and reasonable accuracy, it forbids only the introduction of foreign causes of action. A cause of action different from that originally set up, but allied with it and closely related to it, in subject matter, may be added or introduced by way of amendment. In Belton v. Apperson, 26 Gratt. 207, a leading case on the subject, this doctrine is clearly propounded. In the opinion delivered in that case, Judge Staples, after having reviewed a number of English and American decisions, tersely stated his conclusion in the following terms: “If these cases do not show that the plaintiff is permitted to make a new case, they at least show that he may by his amendment so alter the frame and structure of his bill as to obtain an entirely different relief from that asked for originally. This is founded upon good reason. Why should the plaintiff be put to a new bill for different relief upon the same transaction when the object can be accomplished by an amendment. If there is danger that the defendant will be injuriously affected by the amendment it will be refused, and the suit will be considered as pending only from the time of the amendment.” In Lamb v. Cecil, 25 W. Va. 288, the bill stated one cause of action and the proof disclosed an entirely different one, but closely related to that stated in the bill, and the plaintiff was permitted to amend his bill so as to make the cause of action therein stated conform to that proved. In Doonan v. Glynn, 26 W. Va. 225, the rule is stated thus: “B,ut if in such case the proofs show 'that the plaintiff has a cause which entitles him to relief, that is of a similar nature to that alleged in his bill, and, such as might be made available by proper amendments of his bill, the court on the hearing should *10not dismiss his bill without giving him an opportunity to amend within a reasonable time.” That the rule precludes the introduction of foreign causes of action rather than merely different ones, is asserted in Tidball v. Shenandoah National Bank, 100 Va. 741, in these terms: “If the amendment seeks to assert rights and to enforce claims arising out of the same transaction, act, agreement, or obligation, however great may be the difference in the form of liability as contained in the amendment from that stated in the original bill, it will not be regarded as for a new cause of action.” To limit- the right of amendment to the case or the cause of action stated in the original bill would give it a scope much narrower than our decisions have accorded it. Exclusion of matters merely foreign to the general subject matter of the original pleading affords room for amendment and yet does not permit the litigation to spread beyond reasonable bounds. “Case” and “cause of action” have technical meanings and the right of amendment goes beyond them. Procedure in one suit, for an injunction to prevent extraction of minerals and for an accounting for minerals already taken out, is both permissible and usual. Williamson v. Jones, 39 W. Va. 231, 43 W. Va. 562; South Penn Oil Co. v. Haught, 71 W. Va. 720.
Our conclusion that the subject matter of the amended bill is germane to that of the original bill has important bearing upon another ground of demurrer, namely, that the amended bill sets up a cause of action for which an action at law is pending. This is not the case of an effort merely to transfer from a law court to an equity court, a cause of action for a legal demand. If it were, it would be necessary to allege the necessity and indispensability of discovery to the maintenance of the action. Dudley v. Niswander, 65 W. Va. 461; Prewett v. Bank, 66 W. Va. 184; Thompson v. Whitaker Iron Co., 41 W. Va. 574. In such case, the necessity and indispensability of discovery constitute the only ground upon which the cause of action, after assertion thereof in the law court, can be transferred to and prosecuted in the equity court. Here the situation is different, there is an equitable cause of action pending in the equity court and the additional cause of action set up by the amended bill is germane thereto. In other words, the parties are already in *11litigation in a court of equity, concerning the general subject matter of the two causes of action. The amendment is not tantamount to the institution of a new suit, nor does it amount to a transfer of a single cause of action from one court into another, by way of election. The transaction amounts only to a permissible broadening of the scope of a suit pending in a court of equity.
Though the amended bill discloses the pendency of an action at law for the principal cause of action therein set up, it is not ground uf demurrer. At law, the pendency of a former action for the same cause of action and between the same parties, both actions being at law, is matter of abatement, and, to be available, must be pleaded in abatement. Foley v. Ruley, 43 W. Va. 513; Riley v. Jarvis, 43 W. Va. 43; McCalister v. Harmon, 97 Va. 543. But the rule is different when one suit is at law and the other in equity. The pendency of an action at law for the same cause of action as that set up in a suit in equity does not abate the latter. It merely affords the defendant grounds for an application to the court for a rule against the plaintiff requiring him to elect whether he will prosecute the action at law or the suit in equity. Williamson v. Paxton, 18 Gratt. 475; Priddy v. Hotchkiss, 81 Va. 606; Warwick v. Norvell, 1 Rob. (Va.) 308. Actions at law and suits in equity are so dissimilar in character that the pendency of one cannot be pleaded either in abatement or in bar of the other. Risher v. Wheeling Roofing and Cornice Co., 57 W. Va. 149; Williamson v. Paxton, cited.
Other grounds of demurrer relied upon in the argument submitted are prayers for discovery for a mandatory injunction to require the defendant to permit.the plaintiff to enter the mine, through and over its property, for the purpose of ascertaining, by measurement, the quantity of coal taken from the mine and to aid in such work, by the running of its fan to supply fresh air throughout the workings. Lack of merit in these grounds is perfectly obvious, if the demurrer is general, going to the whole of the- amended bill. In such case, it is only necessary to ascertain that the pleading demurred to sets up sufficient ground for some relief. If it is sufficient in one respect, it is immaterial that it may not be good in others. City of Wheel*12ing v. Chesapeake and Potomac Telephone Co., 82 W. Va. 208; Trough v. Trough, 59 W. Va. 464; Miller v. Hare, 43 W. Va. 647; Shoe Co. v. Haught, 41 W. Va. 279; Gay v. Sheen, 36 W. Va. 582. We have already demonstrated its sufficiency for an accounting. In the written demurrer filed, there is no expression of intention to challenge the sufficiency of any particular part of the hill and eliminate it. Without objection, it was treated as a general demurrer in the order disposing of it. It specifies objectionable purposes and prayers of the amended bill, but only by way of criticism of the pleading in its entirety. The references to the prayer for a mandatory injunction and the allegation of right to discovery are mere statements of grounds of a general demurrer.
Equity jurisdiction of the cause as developed by the pleadings and evidence is denied on the ground of dispute or controversy as to the title to the coal in question, under principles enunciated in Freer v. Davis, 52 W. Va. 1, and subsequent decisions adhering to the doctrine of that case. The defendant is the successor in title of another corporation known as the Buffalo Oreek-Cumberland Coal Company. ' At some past date not disclosed, mining operations were started on what is known as the Ilatfield-Hilles property at Bayard, West Yirginia. Prior to the year 1917, the Buffalo Creek-Cumberland Coal Company owned and operated the property which was composed of the Hubbard tract and the James B. Rees tract, or one of them. It did not own the adjoining Job Aron-halt tract, which is the tract here involved, but it had a verbal arrangement with the owners thereof, George S. Rees and David A. Arnold, the plaintiffs in this cause, under which it was mining in that tract and paying the owners thereof seven cents per ton for the coal mined and taken therefrom. The defendant, directly or indirectly, took over the properties from the Buffalo Creek-Cumberland Coal Co. early in the year 1917, by a conveyance thereof and an.assignment of all of the stock of the latter company. On or about the date of the defendant’s acquisition of the property, which seems to have been in February, 1917, negotiations were opened between it and the plaintiffs for a lease or purchase of their coal in the Aronhalt tract and also for the coal in another tract known as the Woods land, on which *13the plaintiffs claim to have had a lease. Pending these negotiations which finally failed, the defendant continued its mining operations in the Aronhalt tract with the consent of the plaintiffs. After the failure of the negotiations as to the Aron-halt tract and the Woods tract, the plaintiffs, according to their pleadings and evidence, revoked this permission,. on the 15th day of October, 1917, by a notice served upon the defendant, and they say it agreed to stop its operation 'after that date, and, for a long time, they supposed the mining had ceased. But, sometime in the year 1919, prior to the month of August, they discovered that the defendant had never discontinued its operations, but had continued its mining of the coal, without having ever rendered any account thereof or paid for it. The answers do not deny the legal title of the plaintiffs. On the contrary, they impliedly, if not expressly, admit it. They expressly aver a contract of purchase of the coal from the plaintiffs and a breach of the contract on the part of the latter. There is no claim that it was ever conveyed to the defendant. In view of this situation, it is hardly necessary to observe that the decision in Freer v. Davis, which merely excludes from equity jurisdiction issues of fact as to legal title, has no application. Upon its own showing, the defendant could have had nothing more than an equitable title.
The adjudication of equitable as well as legal title in the plaintiffs, upon the pleadings and evidence is challenged. The Buffalo Creek-Cumberland Coal Company owned and managed by Hatfield and Hilles mined the coal under a verbal agreement, permit or license for a period of years; probably three, four or five, paying a royalty of seven cents per ton. They were under no obligation or restriction as to the quantity to be mined yearly or otherwise. There is no proof of any written contract, memorandum or permit signed by the owners. They say they verbally assented to a loose proposition made to them by Hatfield and Hilles or their company. Under it, the mining commenced and the royalties were paid. Admitting this in substance, but calling their right a lease, Hatfield and Hilles say, however, they engaged in the mining and incurred the expense of preparation and equipment, under the belief that they were purchasers of all the coal in the tract, or lessees with *14right to take all of it out, and would not have done so, except for such belief; and that, in their sale of the Buffalo Creek Company’s property, they included such right as they or it had in the Aronhalt land. The Etmmonses acting for their company claim likewise, that they understood the sale included such right and that it amounted to title to the coal. The contract, between the Buffalo Creek-Cumberland Coal Co-, and J. GSrey Emmons does not specifically mention the coa-1 in the Aronhalt tract. It specifies leasehold interests acquired from the McCullough Coal & Coke Co. and the Rees Coal Co. a seven acre tract of land owned in fee by the vendor, its mining plant, contracts for the sale of coal, certain accounts receivable, and then adds “all other property real and personal belonging to it,” except certain accounts receivable. The Emmonses deny that they took a mere verbal permit from the plaintiffs to continue mining in the tract of land in question, pending negotiations for a formal lease or a conveyance of the coal. They say no objection to continuance of the mining was made, but that negotiations were suggested or started for sale of the coal to them at a flat price per acre, and that pending such negotiations they continued to mine as of right; and that, believing their title to- be indefeasible, they installed better-and more expensive equipment in the mine. The testimony of the plaintiffs to the effect that there were negotiations respecting a lease, soon after the Emmons Coal Company took charge of the mining operations, has some support, however, in correspondence. Letters dated in July, 1917, and written on behalf of that company, admit the advisability of some kind of a contract and suggest a lease at seven cents per ton, without a minimum royalty. Plaintiffs say they stood for that rate with a minimum, royalty and that they rejected a counter proposition for a six cent rate with such a royalty. These negotiations ended about. October, 1917, when the notice to cease mining was given. As to whether the defendant agreed to quit, there is square! contradiction in the evidence. After that, if not'before, there were negotiations for purchase of the property by the defendant, and a formal contract of sale of the coal in the Aronhalt and Woods tracts, bearing date Aug. 2, *151919, was prepared but not executed, and the temporary injunction was obtained, Aug. 9, 1919.
Some of the more important claims and contentions made on each side, respecting the substantive rights of the parties, are wholly untenable and have a decided tendency to obscure and conceal the real merits of the controversy. Neither the defendant nor its predecessor in right ever had any title, legal or equitable, to the coal in the Aronhalt tract of land. The plaintiffs clearly have both. But it does not necessarily follow that the defendant was a tenant at will or a trespasser after Oct. 15, 1917. Upon the admitted facts, the law pronounces the defendant’s predecessor a tenant from year to year, and it suffices, without argument, to give the authorities so holding. Drake v. O’Brien, 83 W. Va. 678; Sheets v. Allen, 89 Pa. St. 47; Moore v. Miller, 8 Barr. (Pa.) 272; Ganter v. Atkinson, 35 Wis. 48. One of the incidents or qualities of that tenancy was assignability, and the defendant took it over by its contract and stood in the shoes of the Buffalo Creek Company. Austin v. Thompson, 45 N. H. 113; Cody v. Quarterman, 12 Ga. 386; Pleasants v. Benson, 14 East. 234; 18 Am. & Eng. Ency. L, 207.
Unless the tenancy has been terminated in some one of the modes provided by law, it still continues and the defendant is in no sense a trespasser and cannot be enjoined from further operation, until it has been terminated. Drake v. O’Brien, cited. Neither the verbal notice given October 12, 1917, for immediate cessation, or cessation October 15, 1917, nor the written notice later mailed, was sufficient to terminate it, since the statute requires notice in writing to be given three months prior to the end of the tenancy year. Coffman v. Sammons, 76 W. Va. 13; Arbenz v. Exley, Watkins & Co. 57 W. Va. 580.
Nor was it terminated by surrender. While the evidence is conflicting as to what was said, October 12, 1917, about cessation of mining, that of the plaintiffs is indefinite. It does not say the tenant offered to surrender its term and the offer was accepted. The purport of it is that there was a verbal notice to quit acquiesced in by the defendant and that the plaintiffs did not rely upon that alone. They deemed it advisable to give a written notice and did. Moreover, they weTe *16not dealing with the tenancy as one from year to year. They regarded it as a tenancy' at will, wherefore they could not have treated the transaction as a surrender of a tenancy for a year. The law of surrender by agreement is strict. To comply with it, there must be an actual surrender in praesenti. An agreement to surrender does not effect it. National Union Bldg. Assn. v. Brewer, 41 Ill. App. 223; Donahoe v. Rich, 2 Ind. App. 540. This conversation occurred in Philadelphia and the mining was 'then going on in "West "Virginia. If there was a mere agreement to quit three days later, as seems to have been the case, there was no surrender in fact. Of course, there was none by operation of law, for the defendant néver vacated the mine nor ceased to operate it.
Prom this conclusion, it results that the plaintiffs have entirely misconceived their rights and remedies. They are not entitled to enjoin further operation until they shall have terminated the tenancy of the defendant. Their right to compensation and an accounting arises under the contract of tenancy, the former.being limited to seven cents per ton, and not out of a trespass. Por that, they may or may not have an adequate remedy at law, if it shall become necessary -for them to invoke any remedy. Now that the basic rights of the parties have been determined and fixed, there may be a settlement without further litigation. At any rate, the rights of the plaintiffs stand.upon a basis entirely different from that set up in their bills. Presumptively, there will be no occasion for resort to a court of equity. Under these circumstances, we deem it proper to reverse the decree complained of, dissolve the injunction and dismiss both the original and amended bills, without prejudice to the right of the plaintiffs hereafter to prosecute any proper suit, either at law or in equity, to recover the unpaid royalties on the coal mined by the defendant from the Aronhalt tract of land, and a decree will be here entered accordingly. Costs in the court below as well as in this court will be decreed to the appellant.
Reversed, injunction dissolved, and Mil dismissed.