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Página 22 - ... which has been opened in several places by crosscuts or 45° raises. It has yielded good ore in some parts of the Champion and Baltic mines. The Baltic lode is a wide one, being commonly from 15 to 60 feet and in some places 80 or 90 feet. The thickness at the mines averages about 24 feet. At the Baltic mine the lode strikes N. 60° E. and dips 73° NW This dip is much steeper than that of any of the other lodes being mined. At the Champion mine the Baltic lode strikes N. 26° E. Fissures are...
Página 16 - ... sedimentary with some interbedded layers of igneous rocks. The division line between the two series is the base of the Outer Copper Harbor conglomerate. The copper bearing lodes are, with one exception, in the lower Keweenawan. The exception is a deposit in sandstone in the upper series. The Lower Keweenawan of the Copper Range is chiefly made up of dark grey and brownish volcanic rocks. These occur in beds many of which are between 10 feet and 200 feet in thickness. Many others are thinner or...
Página 14 - ... followed by two long ridges which extend with occasional gaps well out to the end of the point. The northern ridge is called the Greenstone Range, and the southern is known as the Bohemian Range. The plateau and ridges along the central part of the peninsula are formed by the copper-bearing, Keweenawan formation, bedded igneous and sedimentary rocks dipping to the northwest, and striking with the general trend of the point. The western slope down to Lake Superior is formed by the upper members...
Página 21 - ... was proportionally barren, and the amygdaloid was good — giving rise to the theory that the broken rock between the lodes allowed the copper to pass from the amydgaloid into the conglomerate." Production of Calumet conglomerate lode. — The conglomerate has yielded more copper than any other lode on Keweenaw Point, and the metal has been won at a cost which has made the Calumet and Hecla the leading dividend producer among the mines of the world. Mr. JR Finlay estimated, in 1911, that the...
Página 300 - The State of Michigan, embracing sketches of its History, Position, Resources and Industries, 1876, 8vo, 136 pp.
Página 16 - In addition to the dark colored volcanic rocks, there are much smaller areas of light color ed felsitic and porphyritic types, and more basic coarse grained intrusive masses. The felsites do not occur in the immediate vicinity of the chief copper lodes; but are common at both lower and higher horizons. Distinctly grained intrusive rocks, such as gabbros, occur in the Keweenaw series but are not found in the copper mines.
Página 322 - The Michigan Alkali Company's plant for manufacturing Portland cement from caustic soda waste. Engineering News, June 7, 1900. LEWIS, FH The plant of the Michigan Portland Cement Company, Coldwater, Mich. Engineering Record...
Página 131 - ... sampling pick, the latter being chipped with the hammer, or small pieces may be selected from the fine ore. The combined sample, of fine, chipped or selected pieces, from each area should equal the amount taken were it all fine ore. If the contents of the car are all lump ore, the proper sized pieces are chipped from four or five of the lumps in each of the 10 areas, making 40 or 50 pieces from each car, and the total amount of chipped pieces from each of the areas should equal the amount that...