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On the date of the disaster, the oil rig was conducting exploratory drilling in the lake alongside a salt dome under the water, that contained a salt mine. [7] The rig's 14-inch (36 cm) drill assembly had become stuck at 1,228 feet (374 m) two-and-a-half hours before the drilling rig began to tilt. [8]
The mine taps under Lake Erie into the F 1 unit of the Salina Formation, which is more than 70 feet (21 m) high in the area. [4] [5] According to mine manager Bob Supko, it is unusual for a salt mine to be located in an urban area (downtown Cleveland), but it keeps supply close to Cargill's business. [6]
The pumps holding back the waters of the lake stopped and in early 1884 the islet's mine shafts, which had reached a depth of 384 metres, were flooded. They would never be de-watered, and the mine's underground operations would never be reopened. Over the 16 years that the mine was in operation, $3.25 million worth of silver was extracted.
The Copperwood Mine, which is slated to become the closest metallic mine to Lake Superior to date, will sit just west of the state park. Around 500,000 people visit the state park each year.
Lake Superior's deepest point [4] on the bathymetric map. [1] Lake Superior has a surface area of 31,700 square miles (82,103 km 2), [7] which is approximately the size of South Carolina or Austria. It has a maximum length of 350 statute miles (560 km; 300 nmi) and maximum breadth of 160 statute miles (257 km; 139 nmi). [8]
Diorama of an underground salt mine in Germany. Inside Salina Veche, in Slănic, Prahova, Romania.The railing (lower middle) gives the viewer an idea of scale. Before the advent of the modern internal combustion engine and earth-moving equipment, mining salt was one of the most expensive and dangerous of operations because of rapid dehydration caused by constant contact with the salt (both in ...
IMB, the Irvine-Michigan-Brookhaven detector, was a nucleon decay experiment and neutrino observatory located in a Morton Salt company's Fairport mine on the shore of Lake Erie in the United States 600 meters underground.
Stoltz acknowledged CalPortland is a corporation operating under a for-profit model and the mining issue is “politically controversial.” But he sees the project as a necessity given limited ...