Arrastra (HM1005)

Location: Groveland, CA 95321 Tuolumne County
Country: United States of America

N 37° 50.388', W 120° 13.568'

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The Spanish first introduced the arrastra to the New World in the 1500's. The work "arrastra" come from the Spanish word "arrastre", meaning to drag along the ground. When ore was quarried out of the hard rock mines, the quartz had to be crushed to free the gold. The arrastra was the earliest and simplest device introduced into the remote areas of the California Gold Fields to do this operation.

The simplest form of the arrastra was a flat-bottomed drag stone place in a circular, rock-lined pit and connected to a center post by a long arm. With a horse, mule or person provided power at the other end of the arm, the stone dragged slowly around in a circle.

Ore place between the stone floor and drag stone was crushed into a coarse powder after which water and quicksilver were added. The resulting slurry was removed to sluices (troughs) were the gold was recovered.

Thanks to the efforts of the Stanislaus National Forest Groveland Ranger District, the title to the drag stone and all of the floor stones of this arrastra was transferred to the Groveland Yosemite Gateway Museum. It has been reconstructed by local volunteers.
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HM NumberHM1005
Marker ConditionNo reports yet
Date Added Thursday, September 11th, 2014 at 12:33am PDT -07:00
Locationbig map
UTM (WGS84 Datum)10S E 744090 N 4191667
Decimal Degrees37.83980000, -120.22613333
Degrees and Decimal MinutesN 37° 50.388', W 120° 13.568'
Degrees, Minutes and Seconds37° 50' 23.28" N, 120° 13' 34.08" W
Driving DirectionsGoogle Maps
Area Code(s)209
Closest Postal AddressAt or near 18819-18821 Main St, Groveland CA 95321, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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