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An arrastra (or arastra) is a primitive mill for grinding and pulverizing (typically) gold or silver ore. 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 water wheel; a few were powered by steam or gasoline engines, and even electricity.
Arrastras were widely used throughout the Mediterranean region since Phoenician times. The Spanish introduced the arrastra to the New World in the 16th century. The word "arrastra" comes from the Spanish language arrastrar, 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 investment capital.
For gold ore, the gold was typically recovered by amalgamation with quicksilver. The miner would add clean mercury 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 distillation retort to recover the gold, and the mercury was saved for reuse.
For silver ore, the patio process, invented in Mexico in 1554, was generally used to recover the silver from ore ground in the arrastra.




References






External links


Media related to Arrastras at Wikimedia Commons
Arrastra at Encyclopædia Britannica

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Arrasta - YouTube

Arrastra - YouTube

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Arrastra Mill Demonstration By Jerry - At The Laws Railroad Museum And ...

Arrastra - Labelled diagram

The RSI Arrastra An Industrial POWERHOUSE Star Citizen, 48% OFF

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• Arrastra timeline? : r/starcitizen - Reddit
• RSI Arrasta : r/starcitizen - Reddit
• Arrastra Q&A : r/starcitizen - Reddit
• Orion vs Arrastra : r/starcitizen - Reddit
• What's the point of getting the Arrastra in comparison to the
• Arrastra: What are your initial impressions? : r/starcitizen - Reddit
• RSI Arrastra! Loaners are Prospector, Mole and an Arrow!
• RSI Arrastra Loaners : r/starcitizen - Reddit
• RSI Arrastra - Lets discuss the front engines : r/starcitizen - Reddit
• RSI Arrastra discussion : r/starcitizen - Reddit

Arrastra timeline? : r/starcitizen - Reddit

In case you're a copium consumer if any of the Nautilus, Odyssey, Legionnaire, Expanse, or Liberator: during citizencon, we learned the large RSI ships will be completed first in the following order: Polaris -> Galaxy -> Perseus with now the Arrastra likely to follow. Using the development time for the 600i as an exemplar (16mo) with some ...

RSI Arrasta : r/starcitizen - Reddit

Nov 14, 2023 · The Arrastra industrial mining platform was concepted from the struts up with safety and efficiency in mind; remote operator seats provide extra protection to your crew, the onboard refinery is ideal for a more profitable workflow, the automated mineral storage pipeline effortlessly prepares your gathered resources for transfer, and the ...

Arrastra Q&A : r/starcitizen - Reddit

Dec 7, 2023 · Yes, the galaxy is a jack off all trades. It’s not meant to be great, but good enough at a few things. It’s meant to be a partner to smaller mining ships, the Arrastra isn’t a starter mining ship it’s something to work towards.

Orion vs Arrastra : r/starcitizen - Reddit

The arrastra has it's place but make no mistake the Orion is corporate level mining just like the Hull E is corporate level cargo transporting. Arrastra fills a much needed gap but it would take 10 arrastra's to make a dent one Orion would.

What's the point of getting the Arrastra in comparison to the

The Arrastra is the size of Hammerhead, has 2x S3 shields, three turrets each with 4x S3 guns, as well as 2x S5 weapons controlled by the pilot. Yes, if a fleet attacks it it will die, just like litterally every other ship in the game, but the Arrastra will be able to fend off a few light craft and evade while the Orion will be entirely ...

Arrastra: What are your initial impressions? : r/starcitizen - Reddit

The Arrastra appears to load its gathered ore internally, requiring manual removal onto the exteral cargo grid, while the MOLE can just scoop a rock, head to a refinary (Be it station or Orion), drop the bags, snap on new ones, and resume, while the Arrastra has to either have a full-time cargo handler or wait for ores to refine between rocks.

RSI Arrastra! Loaners are Prospector, Mole and an Arrow!

Maybe an unladen Arrastra or Reclaimer could reasonably land for repairs or crew exchanges, but start adding the weight of ore/scrap and they cannot reasonably be flown. Theee needs be a sense of mass and limitations, it would absolutely break immersion and be comical to see something like a Javelin soaring around in-atmo without any assistance.

RSI Arrastra Loaners : r/starcitizen - Reddit

Here is the text from the Page: This loaner vehicle will be a currently playable vehicle of similar approximate size and/or function to the RSI Arrastra – initially the MISC Prospector and Argo MOLE for gameplay in the Persistent Universe and the Anvil Arrow for other game modes.

RSI Arrastra - Lets discuss the front engines : r/starcitizen - Reddit

As per the 3d model on the RSI Arrastra it has a critical flaw for the side turrets, which is the front engines completely cock block their view angles frontally. From a looks perspective they also seem to be tacked on as an afterthought.

RSI Arrastra discussion : r/starcitizen - Reddit

The Arrastra uses cargo pods attached to the outside of the ship for ore, not the cargo bay. The cargo bay is really small, all the storage is unprotected and strapped to the outside. Reply reply