id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
27842	Leith, C. K. (Charles Kenneth)	The Economic Aspect of Geology			.txt	text/plain	163827	7750	56	resources--including such as coal, oil, gas, iron ore, copper, gold, and Mineral products formed by weathering from common igneous rocks include MINERAL DEPOSITS WITHIN AND ADJACENT TO IGNEOUS ROCKS WHICH WERE FORMED and zinc ores of the western United States and the copper deposits of indicate them; so mineral deposits associated with igneous rocks are The deposition of ores of igneous source in the country rock into which RESIDUAL MINERAL DEPOSITS FORMED BY THE WEATHERING OF IGNEOUS ROCKS IN Igneous rocks not containing mineral deposits may on weathering change The value of the United States annual mineral production in recent years basic igneous rock, as in Cuba, may produce important residual iron ore The equivalent of 15 per cent of the iron ore mined in the United States =Technical and commercial factors determining use of iron ore minerals.= high-grade deposits mined in the United States, were derived by surface	./cache/27842.txt	./txt/27842.txt