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Mobile mechanical vein miner; New machine developed for Lucky Friday Mine

机译：移动机械静脉矿工; 新机器为幸运星期五矿井开发

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摘要

The Coeur d'Alene mining district in northern Idaho was first discovered more than 130 years ago and has been the most prolific silver producer in the United States. The Lucky Friday Mine of Hecla Mining Co. (Fig. 1) is the oldest (76 years) and deepest mine in the district, producing approximately 725 t/day (800 stpd) from narrow, vertical lead-zinc-silver veins. Cut-and-fill stoping is currently employed at depths to about 2.3 km (7,500 ft) below ground surface, making it one of the three deepest mines in the western hemisphere. The #4 Shaft, a winze collared at approximately 1.8 km (5,900 ft) below surface and extending to a depth of nearly 2.9 km (9,600 ft), was recently completed to exploit the high-grade 30 Vein, whose resource has been identified to at least 3 km (9,700 ft) in depth.
机译：爱达荷州北部的Coeur d'Alene矿区最早在130多年前发现了超过130年，并成为美国最多的银色生产国。 Hecla矿业有限公司（图1）的幸运星期五矿山是该区最古老（76岁）和最深的矿井，从狭窄的垂直铅锌银静脉中产生大约725吨/天（800 stpd）。 Cut-And-Const Steeting目前在地面下面的深度达到约2.3公里（7,500英尺），使其成为西半球的三个最深的矿山之一。 ＃4轴，一个温度在下面的大约1.8 km（5,900英尺）下方，最近延伸到近2.9公里（9,600英尺）的深度，以利用高档30静脉，其资源已被确定为 至少3公里（9,700英尺）深度。

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