Commonwealth Mine Stamp Mill

Commonwealth Mine Stamp Mill (HM2ACI)

Location: Lead, SD 57754 Lawrence County
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Country: United States of America
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N 44° 21.13', W 103° 45.955'

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Inscription
In the early days of mining stamp mills were used to crush the ore prior to gold recovery. A stamp mill is a very simple machine. The flywheel builds momentum to turn the cam. The cam lifts the stamps and then gravity drops them back down at a rate of 40 times per minute. It can process approximately 1 ton of rock per hour. In gold processing a mercury amalgam was added at the end of the crushing table to recover the gold.
The Homestake Mining Company's first stamp mill was a set of 16 batteries, consisting of 5 stamps each, and hauled to Lead, SD by ox team in 1878. By 1922 over 1000 stamps were crushing ore in Lead, day and night, 365 days per year. The noise was so overwhelming that the residents eventually became used to it and noticed the dramatic change when the stamps were shut down for various reasons.
This stamp mill battery is from a 40-stamp mill that was at the Commonwealth Mine located south of Lead on Strawberry Hill (US Hwy 385). It was powered by a steam boiler and engine and was built in the 1890's.
Details
HM NumberHM2ACI
Tags
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Placed ByBlack Hills Mining Museum
Marker ConditionNo reports yet
Date Added Tuesday, August 14th, 2018 at 10:03am PDT -07:00
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Locationbig map
UTM (WGS84 Datum)13T E 598354 N 4911728
Decimal Degrees44.35216667, -103.76591667
Degrees and Decimal MinutesN 44° 21.13', W 103° 45.955'
Degrees, Minutes and Seconds44° 21' 7.7999999999999" N, 103° 45' 57.3" W
Driving DirectionsGoogle Maps
Area Code(s)605
Which side of the road?Marker is on the right when traveling West
Closest Postal AddressAt or near 272 W Main St, Lead SD 57754, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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