Medinah Mining Inc. (MDHM) Message Board

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Gold/Mining/Energy : Medinah Mining Inc. (MDHM)

MDMN 0.0001000

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Nov 28 9:30 AM EST

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To: Mike Gold who wrote (9742)	3/8/1999 8:44:00 PM
From: Handshake™	Read Replies (1) of 25548

ROASTING AND GOLD RECOVERY Flotation concentrates are thickened, then washed on a 30m2 ceramic disc filter to remove chlorides. Two-stage roasting is used to oxidise pyrite. Arsenic is also removed. Roasting is exothermic and self-sustaining, heat from the reaction being sufficient to maintain the required operating temperatures: 580°C in the first stage, and 650°C in the second. Calcine from the Dorr-Oliver fluidised-bed roasters is cooled, then treated with lime and cyanide solution, with gold recovery on to activated carbon in a series of seven adsorption tanks. Loaded carbon is stripped in a desorption circuit, gold being recovered by electrowinning on to steel wool, calcining to oxidise the steel and subsequent smelting to produce doré bars.

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