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The Willow Creek mining district, also known as the Independence Mine/Hatcher Pass district, is a gold-mining area in the U.S. state of Alaska. Underground hard-rock mining of gold from quartz veins accounts for most of the mineral wealth extracted from the Hatcher Pass area. The first mining efforts were placer mining of stream gravels, and ...
Quartzite can have a grainy, glassy, sandpaper-like surface. Quartzite is a hard, non-foliated metamorphic rock which was originally pure quartz sandstone. [1] [2] Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic belts.
The quartz ledge at the Crystal Mine was first discovered in 1895 by B. Heins. It was so named because of the large pyrite cubes which were found occurring in the surface outcrops of the ledge. Gold was extracted till 1905 from quartz using ten-stamp mill and from about 1,000 feet of underground workings yielded 1,210 ounces of gold .
It was discovered in 1910 by Peter Strong, who arrived in Alaska during the Klondike Gold Rush of 1998. Strong initially staked a small gold claim in the area before discovering the quartz vein that would become the Indian Valley Mine. He operated the mine through the 1920s and 1930s, during which time he built a cabin and an assay house.
While pure quartzite is usually white or gray, Baraboo Quartzite is typically dark purple to maroon in color, due to the presence of iron and other impurities. [2] Baraboo Quartzite may display strata created by progressive deposition of layers of sand in the original sandstone from which the quartzite was formed (through metamorphism ). [ 2 ]
An adult great white shark can grow to around 20 feet long and weigh over 4,000 pounds. It takes so much energy for a shark that size to propel itself into the air that the risk may not be worth ...