1266

Mining Company Pin

Currency:USD Category:Collectibles / Mining Start Price:35.00 USD Estimated At:70.00 - 150.00 USD
Mining Company Pin
SOLD
95.00USDto b******1+ buyer's premium (21.38)
This item SOLD at 2015 Apr 10 @ 11:50UTC-7 : PDT/MST
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Full color pin: The Big Five, Office 703 Kittredge Bldg., Denver Colorado. An adit (from Latin aditus, entrance) is an entrance to an underground mine which is horizontal or nearly horizontal, by which the mine can be entered, drained of water, ventilated, and minerals extracted at the lowest convenient level. Adits are also used to explore for mineral veins. Adits are driven into the side of a hill or mountain, and are often used when an ore body is located inside the mountain but above the adjacent valley floor or coastal plain. In cases where the mineral vein outcrops at the surface, the adit may follow the lode or vein until it is worked out, in this case the adit is rarely straight. The use of adits for the extraction of ore is generally called drift mining. Adits can only be driven into a mine where the local topography permits. There will be no opportunity to drive an adit to a mine situated on a large flat plain, for instance. Also if the ground is weak, the cost of shoring up a long adit may outweigh its possible advantages.



The 1.5" diameter pin depicts a mine opening--Adit tunnel showing a car full of ore.

City: Denver
State: Colorado,
Date: 1890's

FHWAC#: 26449