Opinion by
Mr. Justice Brown,On August 28, 1902, the appellants leased property belonging to them in Reade township, Cambria county, to E. F. Spencer, A. T. Beers and William D. McCausland, for the purpose of mining coal. The lease, with the assent of the lessors, was assigned to Christian P. Anderson, who assigned it to the appellee, The Anderson Coal Mining Company, and this suit was brought against it to recover the balance alleged to be due *477on the first year’s minimum royalty of $1,800, or six cents per ton for 80,000 tons of coal. The covenant in the lease which is the basis of appellants’ claim is, that the lessees will “ mine and ship from the said premises not less than thirty thousand tons during each and every year during the continuance of this lease, and shall pay royalty for said amount whether mined and shipped or not, unless prevented by faults in the strata unforeseen, difficulties in the mines, strikes, scarcity in car supply or other unavoidable causes.”
On the trial of the cause it appeared that during the first year no effort to mine the coal had been made on the leased premises, but an attempt was made to reach it through a mine operated by the appellee on adjoining land known as the Van Ormer tract; and the jury were instructed that, if faults were encountered there which rendered it impossible to reach the coal on the leased premises, the plaintiffs could not recover. Under the testimony submitted by the defendant the jury found that faults in the adjoining mine had prevented it from reaching and mining the coal on the leased premises, and the verdict was in its favor. We need not consume time in demonstrating the self-evident proposition that the lease contemplated an effort on the leased premises to reach the coal, and that the faults contemplated were such as might be there encountered. Indeed, this is not questioned by the appellee, but it is urged that, as the cause was tried on the theory that there could be no recovery if the defendant company was prevented from reaching the coal on the leased land by faults in the strata on the Van Ormer tract, we ought not to disturb the judgment. If the record showed that the cause had been tried upon that theory alone, and nothing more appeared, we would not interfere with the judgment, for if the lessors themselves had put such an interpretation on the agreement, it would be too late for them, after a verdict against them, to complain of the consequences resulting from their own construction of the lease. When a case is submitted to a jury from the standpoint from which both parties to the issue manifestly tried it, the court cannot be said to have erred because it was not submitted from another, which may really have been the true one : Hartley v. Decker, 89 Pa. 470 ; Carpenter v. City of Lancaster, 212 Pa. 581.
The defendant undertook to show, without objection from *478the plaintiffs, that it hacl made an effort to reach the coal on the leased premises through the opening on the Van Ormer land, but had been prevented from doing so by the faults there found in the strata. In rebuttal, the plaintiffs offered testimony to show that if proper efforts had been made on the adjoining land the coal on theirs might have been reached, and, as just stated, if there were not more on the record, we would not reverse. It appears, however, that the plaintiffs, in meeting the defense as made out by the appellee, did not conclude themselves from asking that the case be tried on the proper theory, that the effort to mine the coal should have been made on the leased premises. Though no effort was made during the first year to open the coal on these premises, it appeared on the trial that at that time — September 21, 1904 — coal was opened on them. C. R. Ellicott, the resident manager of the appellee, and called by it as a witness, was asked on cross-examination: “ Q. During the time you were there the work in which you were engaged was principally in the directing of the mines and the shipment of coal from the Van Ormer tract? , A. Yes, sir. Q. But not upon the Glasgow and Troxell? A. No, sir.....Q. You did get into the Troxell and Glasgow tract? A. Yes, sir; we are in there now.....Q. So far as anything is disclosed from the condition of the mine as it appears there now, there is no fault on the Troxell and Glasgow tract? A. Not where we tried to turn the heading. ” Another witness called by the defendant — James Logan, its mine foreman — on cross-examination, testified as follows : Q. The faults that you have observed are all on the Van Ormer property? A. Yes, sir. Q. From the investigations which you made ther’e were no faults visible on the Troxell and Glasgow tract? A. No, sir; not at present. Q. So far as it appears now, from an inspection of the mine, the coal of the Glasgow and Troxell tract is in its normal condition? A. Yes, sir. Q. You have so far no evidence or intimation of the fault on that property? A. No, sir.” The seventh point submitted by the plaintiffs was as follows: “ The defendant having failed to show that any effort was made to mine the coal on the Glasgow and Troxel property from the opening, on' that.property itself, and the evidence being that the coal was opened on that property the defendant did not make the effort to mine the 80,000 tons of coal, which was *479required under tlie terms and conditions of the contract. ” This was a distinct statement by the plaintiffs before the case was submitted to the jury of just what their contention was, and the point should have been affirmed. It stated the true construction of tlie agreement and what the plaintiffs had a right to insist upon from the defendant, which ought to have done from the beginning what it was doing in September, 1904. The answer to the point was: “Wo cannot affirm the point as a legal proposition. There is no evidence that any effort was made to open the coal upon the property described in the lease. There is no evidence that it could be done to any advantage. There is some evidence that some vein of coal was opened by Mr. Spencer, but there is no evidence that it was a feasible point from which to mine the coal or that it was intended that any extensive mining operations should be pursued at that point. ”
The assignments relating to the scarcity of cars ne.ed not be considered, for that question cannot be regarded as involved in the case in the absence of any effort by the appellee to mine the coal in accordance with the agreement. Its learned counsel make the following frank admission in their printed argument: “ The undisputed evidence in the case showing that cars enough had been received at this particular mine to ship over thirty thousand tons during the year 1903, the irresistible conclusion is that the jury so found, and the question of car supply, as an independent matter of defense being‘out of the way altogether,’ the verdict was based upon the other question in the case. ”
We are asked by the appellants to pass upon the correctness of the instruction by the court below, that if they were entitled to recover, the verdict should be for the balance of the royalty for the first full mining and shipping year ending December 1, 1903. Of this, of course, they do not complain, but in their anticipation of a reversal they ask for an expression from us as to the correctness of the instruction for the guidance of the court below on a retrial of the case. We do not sit as an advisory board for lower courts, but to correct errors alleged to have been committed by them when brought up to us by proper assignments. The first, fourth, fifth, sixth and twelfth assignments are sustained and the judgment is reversed with a, venire facias de novo.