id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
26697	Hoover, Herbert	Principles of Mining: Valuation, Organization and Administration			.txt	text/plain	61715	3850	68	In a general way, only the ore which must be mined need As mines are opened by levels, rises, etc., through the ore, an The risk in estimates of the average value of standing ore is dependent All ore-deposits vary in value and, in the miner's view, only those From the point of view of continuity of values, ore-deposits may In considering the working costs of base-metal mines, much depends work economically extension of the ore-bodies is a matter of no vertical shafts are largely applied to coal-mines, and some engineers There was a time when mines were worked by driving the level on ore SUPPORT BY PILLARS OF ORE.--As a method of mining metals of the objectives is to work the ore at the least cost per ton, it is work which yields ore be charged to stoping account, and if cost and the stoping cost worked out on all ore hoisted, it will include	./cache/26697.txt	./txt/26697.txt