“ Legislation requiring the owners of adjoining coal properties to cause boundary pillars of coal to be left of sufficient width to safeguard the employees of either mine in case the other should be abandoned and allowed to fill with water cannot be deemed an unreasonable exercise of the power. In effect it requires a comparatively small portion of the valuable contents of the vein to be left in place, so long as may be required for the safety of the men employed in mining upon either property. ”

“ It is objected that the act presupposes a condition which does not always exist; viz., that the owners of coal properties have engineers in their employ; whereas it is insisted that there are many coal owners who employ no engineer; especially among the lessors of coal property. But it cannot be seriously doubted, the business under regulation being so dangerous, that it is within the power of the state to declare that coal mining shall not be conducted without the employment of an engineer ”

“ Certainly this court ought not to adopt a contrary construction in the absence of something in the state decisions to require it.
Respecting this and some of the other objections, it should be said that the difficulties suggested are hypothetical rather than practical. Plaintiff in error had actual notice in fact, and made no objection on the score of lack of sufficient notice. Its lessor is not objecting. Plaintiff in error presumably has an engineer competent to represent it, or could readily employ one. ”

“ Indeed, the statute seems to contemplate some judicial control, for it prescribes no penalty for a violation of the findings of the engineers and inspector, nor any mode of enforcing their determination except by a suit for injunction under art. 15 of the act. In such a suit a party deeming himself aggrieved because of arbitrary action by the statutory tribunal may presumably have his opportunity to be heard with respect to this as well as other fundamental defenses. ”

“ We think it not an unreasonable construction that if the engineers disagree they shall submit their differences to the inspector, and that a determination agreed to by one of them in conjunction with the inspector shall fulfil the requirements of the act. It must be remembered that this tribunal is to settle, not a private property right, but a matter affecting the public safety ”

“ The owner on each side has a single engineer in the make-up of the body; and if there be a subdivision of the property on one side of the line, there would no doubt be separate findings with respect to the frontage of each subdivision. ”