Arrastras Historic Gold Mining Method for Processing Ore
Arrastras An arrastra also known as a Mexican Rastra was a primitive method used by early miners to process gold and silver ores It was introduced to the new world by the Spanish in the 1500 s They were used throughout the world often at remote locations where other processing methods were not feasible.
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A gold mill houses the equipment necessary to remove gold from the surrounding waste rock either by concentrating it or by mechanically separating it The stamp battery is the heart of a stamp mill and the mechanical separation process to break the various components of the ore apart freeing the gold from its enclosing material.
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A stamp mill is a large mechanical device used to crush ore and extract the desired metals from the host material It uses heavy steel stamps to crush and break apart material releasing the valuable gold from worthless rock allowing for the extraction of gold for further refining.
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2 days ago They sometimes used mercury which forms an amalgam with small particles of gold and silver Miners used mechanical crushing and grinding machines to break up ores for further processing Early miners used Mexican arrastras or stamp mills which reached their peak in the late nineteenth century to crush ores into sand size particles.
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Using stamp mills hard rocks take 5 hours/tonne to be ground and concentrated whereas soft ores take 1.8 hours/tonne Miners prefer milling centers with stamp mills as they believe that ball mills retain part of the gold in the internal liners The lack of gold liberation is an evident problem when using stamp mills
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The term stamp mill usually refers to a type of mining equipment used to crush ore containing rock although it also can mean the building in which the rock is crushed In ancient times variations of the stamp mill were used for pounding grain for processing oil from seeds and in the paper making process.
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The Yellow Jacket Mine resumed operations in the early 1890 s and in 1892 miners build a 20 stamp mill.The mine produced intermittently depending on prices and labor availability for many years By 1890 the main Yellow Jacket shaft had reached a depth of 50 feet and remained in excellent ore A settlement was built including a school and saloon.
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The arrastra of Death Valley s Gold Hill mill was built in 1934 The Mexican arrastra also rastra or arastra was the earliest type used during the California Gold Rush in the 1850s Simply constructed these devices consisted of a flat track of stone inside a low wall of rock or wood forming a basin to hold the ore and center
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