Patent ID: 6138833
Filing Date: 2000-10-31
Classification: B03B,B03C,C22B,E02F,E21C,Y02P

Abstract:
A method of mining and separating placer gold, comprising:inserting a lifting pipe into the earth until a bottom end of the lifting pipe reaches a predetermined depth, wherein a sand mixture including placer gold and water is located at the predetermined depth;sucking the sand mixture up through the lifting pipe to an elbow in a top end of the lifting pipe at a surface of the earth, said sucking being accomplished by supplying a jet stream to the sand mixture at the elbow in the lifting pipe so as to accelerate a flow rate of the sand mixture through the lifting pipe;conveying the sand mixture from the elbow in the top end of the lifting pipe through a horizontal transport pipe;separating an intermediate mixture including placer gold from the sand mixture by varying a flow rate of the sand mixture through the transport pipe so that the intermediate mixture having a greater specific gravity than a remainder of the sand mixture settles out of the sand mixture during periods of slow flow rate due to the greater specific gravity;mixing the intermediate mixture with water so as to form a second intermediate mixture including water, wherein the second intermediate mixture comprises 70% to 90%; andseparating a placer gold material from the second intermediate mixture by conveying the second intermediate mixture through a magnetized cylinder such that a magnetic force of the magnetized cylinder holds the placer gold material to an inner wall of the magnetized cylinder, wherein the magnetic force along a longitudinal axis of the magnetized cylinder ranges from 5000 gauss to 200000 gauss.