Open AccessThe Process Designing of Gold Extraction from Placers of Passu to Shimshal (Hunza Valley) Gilgit-Baltistan by Mercury Amalgamation and Cyanidation Leached Method
Author(s) -
Muhammad Ashraful Alam,
Javed Akhter Qureshi,
Garee Khan,
Manzoor Ali,
Naeem Abbas,
Sher Sultan,
Asghar Khan,
Yasmeen Bano
Publication year - 2020
Publication title -
international journal of economic and environment geology
Language(s) - English
Resource type - Journals
ISSN - 2223-957X
DOI - 10.46660/ojs.v10i4.348
Subject(s) - gold cyanidation , placer mining , gold extraction , tailings , mercury (programming language) , metallurgy , leaching (pedology) , cyanide , geology , materials science , computer science , soil science , soil water , programming language
Gold wash through panning or washing in the fluvial sediments or sands is done on the river banks inSkardu, Hunza and other places. The method of gold washing is very crude, primitive and most of the gold is washedaway back into the river. The current study mainly focused on extraction of placer gold deposits. Pneumatic machinesfrom Passu to Shimshal (Hunza valley) Gilgit-Baltistan. The mercury amalgamation and cyanide leached methods havebeen used for placer gold deposits extraction from the concentrate obtained from shaking table. The amount of goldrecovered from amalgamation method with mercury was 30.9%. The alloyed gold with other metals, gold dust, and finegold was recovered by chemical process. The reagent consumption, i.e. 1.4 kg/ton of NACN and 6 Kg / ton of CaOwere used for extraction of placer gold deposits. The extracted gold is 10.24 g /t and silver 22 g /t and the remaininggold like the amalgamation residue, tailings and middlings are extracted by cyanidation leached method. The extractionof gold by cyanidation process was compared graphically, and study results revealed that extraction of gold usingcyanidation leached method was 91.40% and silver 100%, respectively.