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62:. Its simplest form is two or more flat-bottomed drag stones placed in a circular pit paved with flat stones, and connected to a center post by a long arm. With a horse, mule or human providing power at the other end of the arm, the stones were dragged slowly around in a circle, crushing the ore. Some arrastras were powered by a
107:
to the ground ore, continue grinding, rinse out the fines, then add more ore and repeat the process. At cleanup, the gold amalgam was carefully recovered from the low places and crevices in the arrastra floor. The amalgam was then heated in a
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meaning to drag along the ground. Arrastras were suitable for use in small or remote mines, since they could be built from local materials and required little
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119:, invented in Mexico in 1554, was generally used to recover the silver from ore ground in the arrastra.
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Van Bueren, Thad M. (2004). "The 'Poor Man's Mill': A Rich
Vernacular Legacy".
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66:; a few were powered by steam or gasoline engines, and even electricity.
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Primitive mill for grinding and pulverizing gold or silver ore
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to recover the gold, and the mercury was saved for reuse.
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IA, The
Journal of the Society for Industrial Archeology
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in the 16th century. The word "arrastra" comes from the
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211:. California State University-Chico. Archived from
178:. Groveland Yosemite Gateway Museum. Archived from
99:For gold ore, the gold was typically recovered by
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103:with quicksilver. The miner would add clean
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69:Arrastras were widely used throughout the
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23:Typical arrastra construction. From
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294:Non-ferrous extractive metallurgy
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81:introduced the arrastra to the
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647:Bottom-blown oxygen converter
47:(or arastra) is a primitive
25:Mining and Scientific Press
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35:Arrastra demonstration in
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373:Underground in soft rock
368:Underground in hard rock
209:Plumas County Adventures
246:Encyclopædia Britannica
176:"Gentry Gulch Arrastra"
215:on September 16, 2016.
205:"What is an Arrastra?"
40:
28:
902:History of metallurgy
701:(by aqueous solution)
533:Gravity Concentration
282:Extractive metallurgy
34:
22:
816:Hall–Héroult process
495:Mechanical screening
238:at Wikimedia Commons
115:For silver ore, the
71:Mediterranean region
538:Magnetic separation
485:Cyclonic separation
306:(by physical means)
291:Metallurgical assay
110:distillation retort
37:Liberty, Washington
619:Refractory linings
490:Gyratory equipment
302:Mineral processing
94:investment capital
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897:History of mining
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743:Gold chlorination
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326:Natural resources
321:Geological survey
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234:Media related to
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738:In situ leaching
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182:on 2011-10-04
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803:Electrolysis
763:Amalgamation
518:Jameson cell
475:Hydrocyclone
409:
213:the original
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203:Cooke, Ron.
184:. Retrieved
180:the original
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142:
114:
101:amalgamation
98:
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68:
44:
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839:Co-products
673:Calcination
637:Cupellation
553:Dry washing
542:Magnetation
465:Ore sorting
430:Pebble mill
397:Comminution
151:(2): 5–23.
77:times. The
64:water wheel
891:Categories
876:Stamp sand
826:Downs cell
558:Buddle pit
548:Rocker box
405:Stamp mill
346:Base metal
314:Extraction
186:2011-03-22
123:References
90:arrastrar,
75:Phoenician
718:Lixiviant
683:Liquation
576:(by heat)
437:Ball mill
380:Recycling
236:Arrastras
83:New World
846:Tailings
710:Leaching
678:Roasting
629:Refining
613:ISASMELT
585:Smelting
442:Rod mill
425:SAG mill
410:Arrastra
242:Arrastra
157:40968663
45:arrastra
871:Red mud
861:Clinker
615:furnace
523:Panning
480:Trommel
470:Vanning
447:IsaMill
420:AG mill
415:Crusher
363:Surface
341:Mineral
105:mercury
79:Spanish
851:Gangue
652:Poling
458:Sizing
358:Mining
155:
73:since
57:silver
39:, 2007
666:Other
385:Scrap
153:JSTOR
866:Chat
856:Slag
53:gold
49:mill
331:Ore
244:at
60:ore
55:or
43:An
893::
207:.
195:^
165:^
149:30
147:.
131:^
96:.
544:)
540:(
274:e
267:t
260:v
189:.
159:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
