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Homestake high-grade gold ore, view is about 1.2 cm wide. The gold ore mined at Homestake was considered low grade (less than one ounce per ton), but the body of ore was large. [8] Through 2001, the mine produced 39,800,000 troy ounces (43,700,000 oz; 1,240,000 kg) of gold and 9,000,000 troy ounces (9,870,000 oz; 280,000 kg) of silver.
Frank La Roche Photographs. 312 photographs c. 1888-1910 depicting scenes of the 1898 Klondike Gold Rush, A small photograph album (ca. 1891) used as a sales tool. Photographed by Frank La Roche, it contains an historical photographic record of early Seattle and its expansion northwards along the shores of Lake Union , Seattle, Washington state ...
Panning for gold was the simplest method of recovering gold, but mostly used for prospecting since it was slow. A faster way was by a rocker box or by sluicing. Dirt was filled into the box or sluice together with water and rocking movements or gravity would make the gold particle go to the bottom whereas sand and fine gold particles would flow ...
It made automotive tools, such as wrenches and sockets, [1] and a number of specialty tools. [2] Blackhawk introduced a number of innovations to conventional drive tools, such as the "Lock-On" system of locking sockets, [3] gearless ratchets, [4] [5] telescoping ratchet handles, [6] and 7/16" drive tools. [7]
Currently R8 and Erickson #30 Quick Change tool holders are available. Machine slides are of the dovetail type, and rotary bearings are mostly of the roller and ball types. Through 1970, Bridgeport turret milling machines were made under licence by Adcock-Shipley, a UK manufacturer of horizontal and vertical milling machines founded during WW1.
Gold prospector pouring water through his rocker box, Pinos Altos, New Mexico (1940). Rocker box exhibit at Dahlonega Gold Museum. A rocker box (also known as a cradle or a big box) is a gold mining implement for separating alluvial placer gold from sand and gravel which was used in placer mining in the 19th century.