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" Michigan for 1914 and 1915, by counties. 1914. 1915. 1 Some of the terms used to designate the different materials entering into the mining industry differ for the Lake district from those employed in any other part of the country. Ore is known as "rock... "
Mineral Resources of the United States - Page 72
by United States. Bureau of Mines - 1917
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Mineral Resources of the United States

Digital images - 1912 - 1062 pages
...tons of rock. In the " pickings " only a portion of the silver contained in the rock is recovered. 1 Some of the terms used to designate the different...concentration is known as "mineral; the term "ore" is used to designate the copper minerals (arsonldes, sulphides, etc.) that occur to a llmitec" extent...
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Mineral Resources of the United States, Part 1

United States. Bureau of Mines - Digital images - 1917 - 1200 pages
...and 1915: Production of silver and copper in Michigan for 1914 and 1915, by counties. 1914. 1915. 1 Some of the terms used to designate the different...(arsenides and sulphides) that occur to a limited extent in ths district. Large bodies of native copper are known as "mass" and smaller ones are designated...
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Mineral Resources of the United States, Part 1

Digital images - 1918 - 1100 pages
...amygdaloid "rock" yielded 17.1 pounds of copper per ton, as compared with 17.7 pounds per ton in 1911. 1 Some of the terms used to designate the different...district from those employed in any other part of tho country. Ore is known as "rock" or "copper ground" (if unminod); the product of concentration is...
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Mineral Resources of the United States, Part 1

United States. Bureau of Mines - Digital images - 1919 - 972 pages
...small quantity of " barrel" and "mass" copper is sorted at the mines ami sent direct to the smelters. 1 Some of the terms used to designate the different materials entering into tho mining industry differ for the Lake district from those employer! in any oilier part of the country....
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Mineral Resources of the United States, Part 1

United States. Bureau of Mines - Digital images - 1921 - 1282 pages
...Mirtiignn in 1917 and 1918, 6j/ counties. Includes copper from sands. 6 Includes "mineral" from sands. 1 Some of the terms used to designate the different...differ for the Lake district from those employed In nny other part of the country". Ore is known as " rock," or (if unmined) " coppper ground " ; the prodiret...
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Mineral Resources of the United States, Part 1

United States. Bureau of Mines - Digital images - 1921 - 1102 pages
..."mineral" from .sands. ' Some of the terms used to designate the different materials entering into I lie mining industry differ for the Lake district from...other part of the country. Ore is known as "rock," or (If un mined) "copper ground"; the product of concentration is known as "mineral"; and the term "ore"...
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Mineral Resources of the United States

Digital images - 1922 - 992 pages
...1918 and J.11V, ft// counties. a Includes copper from sands. h Includes "mineral'' from sands. • Some of the terms used to designate the different materials entering into the mining industry in the Lake district differ from those employed in any other part of the country. Ore is known as "rock"...
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United States Congressional Serial Set

United States - 1912 - 1046 pages
...tons of rock. In the " pickings " only a portion of the silver contained in the rock is recovered. 1 Some of the terms used to designate the different...Ore is known as " rock " or " copper ground " (If unmlned) ; the product of concent ratio'n is known as " mineral ; the term " ore " Is used to designate...
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