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LeachMine:  Heap Leaching, Slope Stability and Reclamation

Heap Leach: Mining's breakthrough technology
Thursday, August 20, 2015
Amid turmoil on commodity markets and a relentless drive by mining companies to increase efficiencies, heap leaching has emerged as a breakthrough technology experiencing stunning growth over the past decade. read more »
IsaMill™ selected for Sumitomo’s Pogo Mine operation
Friday, August 07, 2015
Glencore Technology’s IsaMill™ technology has been selected by Sumitomo Metal Mining Pogo LLC for their Pogo Mine operation in the US state of Alaska. read more »
Perth-based university discovers new uranium extraction method
Monday, June 15, 2015
New research by the Murdoch University, in Perth, Western Australia, has discovered a technique to extract uranium from brannerite, which could result in an additional 1 000 t, or A$108-million, in yearly uranium exports for Australia. read more »
Gryphon says study confirms Banfora heap leach potential
Tuesday, February 04, 2014
An optimisation study has identified a low-cost, heap leach start-up for developer Gryphon Minerals’ Banfora gold project, in Burkina Faso. read more »
Encouraging Preliminary Metallurgical Testwork for Oxide Heap Leaching at the South Houndé Project
Thursday, January 30, 2014
Sarama Resources Ltd. is pleased to announce that preliminary metallurgical testing at its flagship South Houndé Project in south-west Burkina Faso has returned encouraging results, indicating potential for heap leach processing of oxide mineralisation. read more »
Tank-leaching Plant Launched in Azerbaijani Region
Thursday, June 06, 2013
A tank-leaching plant has been fully commissioned at the large Gadabay gold, copper and silver mine in Azerbaijan. Anglo Asian Mining, a company extracting precious metals in resource-rich Azerbaijan, said that the plant is expected to increase gold production and mine life at Gadabay, while lowering operating costs. read more »
Heap Leach Conference Coming Soon
Friday, April 26, 2013
There is a new conference being organized that will cover all aspects of heap leaching. The conference will take place in Vancouver, September 22-25, 2013. read more »
New Technique to Transform Precious Metal Recovery
Wednesday, March 06, 2013
Murdoch University researchers have come up with a new approach to make the recovery of high value precious metals faster and more economically viable. Dr Chun-Yang Yin and Dr Aleksandar Nikoloski said the rising cost of metals such as platinum and palladium made recovery economically and environmentally vital. read more »
Tailings and Mine Water Conferences in 2013
Tuesday, December 18, 2012
I estimate you could spend at least a full month in 2013 attending conferences on tailings; and you could travel around the world while doing so. Here are some you should attend. read more »
Evaluating Mining Project EIAs
Thursday, March 15, 2012
The Environmental Law Alliance Worldwide at this link has a publication all prospective miners and mine investors should read. The publication is free to download. I have, and recommend you do so too. The document is Guidebook for Evaluating Mining Project EIAs. read more »
More on EIAs for Mines, New, Expanded, or Closing
Thursday, March 15, 2012
Integral to any new mine or expansion of a mine is the preparation of an Environmental Impact Assessment (EIA). If you seek to significantly expand the mine’s tailings, waste rock, or heap leach facilities, you may have to prepare a new or supplemental EIA read more »
Heap Leach Acid Mists Conundrum from Zambia
Friday, February 17, 2012
Here is a conundrum for those interested in heap leach pad operation. It arises from a heap leach pad in Zambia. read more »
Project Objectives for Management of Tailings, Waste Rock, and Heap Leach Pads
Thursday, January 12, 2012
As in any project, set the project objectives before you do anything else. Here are some objectives grouped according to the major activities (tasks) that are commonly used in mine waste disposal projects. read more »
Valley Heap Leach Pads in Cold Climates
Tuesday, November 01, 2011
Here's an interesting issue: how to design a heap leach pad in a cold climate? The problem is in a cold place, the lixiviant that is introduced to the top of the pad of rock may freeze before it seeps through the pile of ore. read more »
Bellavista, Costa Rica and the Persistence of Mining: How to Fix Mine Failures?
Wednesday, April 20, 2011
Greed, speed, and engineering carelessness all led to the massive failure of the Bellavista heap leach pad in Costa Rica. The failure of the pad led to the closure of the mine and bankruptcy of the company. read more »
Copper Recovery
Wednesday, September 30, 2009
The metallurgical heart of the majority of copper oxide processes is the heap leaching operation. Mineral Engineering Technical Services (METS) in Perth notes the success of this unit operation "is so important that operators need to understand the ramifications of their decisions or non-decisions and how they could affect the downstream processing" read more »
Nevada Heap Leach Pad Gets Geosynthetic Cover
Tuesday, September 15, 2009
Here is a story about the old Wood Gulch mine in Nevada where Barrick has installed a "synthetic liner" over the heap leach pad. read more »
Heap Leach Pad Failure Modes & Effect Analysis
Friday, December 05, 2008
Here is a PowerPoint presentation that correctly applies the Failure Mode & Effect Analysis methodology to a hypothetical heap leach pad. read more »
Heap Leach Questions
Friday, November 14, 2008
Here are ten good questions that could be asked about decommissioning any heap leach pad. read more »
Heap Leach Pad Risks
Wednesday, September 03, 2008
Risk management enables you to identify risks and take action to avoid them before you get hurt. At least that is the theory. read more »
Inproheat and Heap Leaching
Friday, August 08, 2008
Getting the lixiviant to all parts of the heap leach pad is a common operational problem. But if you can get lixiviant of the right temperature to all parts of the heap leach pad, the payback can be great. read more »
Talvivaara Heap Leach
Tuesday, July 29, 2008
This case history of a new heap leach operation is courtesy of E&MJ, May 2008. They describe a new heap leach pad at the Talvivaara Mine in Finland read more »
Pierina Gold Mine
Thursday, June 12, 2008
GoldSim to the rescue again: an abstract for the conference on Tailings & Mine Waste ’08 tells of a water balance model for the Pierina Gold Mine in Peru using GoldSim for the entire plant. read more »
Bellavista Photos
Tuesday, April 22, 2008
Words cannot quite convey what these photos show. Here are many more photos of the failed Bellavista Heap Leach Pad in Costa Rica. read more »
Sullivan Mine Safety Guidelines
Tuesday, April 22, 2008
From the Proceedings of the Sixth Australian Workshop on Acid and Metalliferous Drainage, held in mid-April 2008 is a paper entitled "Sullivan Mine Fatalities Incident: Preliminary Technical Investigations and Findings". read more »
Heap Leach Pad Application Rates
Wednesday, April 09, 2008
The materials in a heap leach pad constitute a heterogeneous, anisotropic mass. Material hydraulic conductivities vary greatly from point to point. read more »
Thursday, April 03, 2008
FEMLAB can be used to model heap leach pad performance. Here is a description of the code read more »
Costa Rica Mining
Friday, March 28, 2008
There are few mines in Costa Rica. Tourism is more lucrative. And it seems so too are displaced Americans and Canadians building houses at bargain basement prices. read more »
Heap Leach Software
Monday, January 21, 2008
Computer codes to simulate and model the performance of leach pads abound—any code that calculates a factor of safety against instability will work on a heap leach pad problem, and the same is true for most aspects of heap leach pad performance. read more »
Bellavista Heap Leach Pad
Friday, January 18, 2008
From the Costa Rica Tico Times comes a long article on the human impact of the closure of the Glencairn Bellavista mine as a result of the downhill sliding of the heap leach pad. read more »
Bellavista Heap Leach Pad Update
Wednesday, November 21, 2007
A few days ago, I received an unsolicited e-mail about the Bellavista heap leach pad failure. Here is an extract. read more »
Conference of Metallurgists Abstracts
Wednesday, October 17, 2007
At this link you will find the program and abstracts from a past Conference of Metallurgists. To keep you informed and help you decide, here are my edited versions of abstracts of papers that caught my attention. read more »
Heap Leach Pad Law
Thursday, September 20, 2007
The Gros Ventre and Assiniboine Tribes reside on the Fort Belknap Indian Reservation, located in north-central Montana. Two cyanide heap-leach gold mines are located outside, but near the southern boundary of, the Fort Belknap reservation, in the Little Rocky Mountains mining district. read more »
Performance Based Codes
Tuesday, September 11, 2007
There has been much criticism of the draft Environmental, Health and Safety Guidelines for Mining recently published by the World Bank. read more »
International Mining on Heap Leaching
Tuesday, September 04, 2007
John Chadwick of International Mining brings us another of those timely reviews on a topical mining subject: heap leaching. read more »
Heap Leaching for Lawyers
Monday, August 20, 2007
You have to admire the skill of lawyers in crafting descriptions. Here is a legal description of heap leaching. read more »
Glencairn in Costa Rica
Wednesday, August 15, 2007
There is a lesson for us all in the failure of the heap leach pad at the Bellavista mine. Here is an edited version of the first news report I saw read more »
Agglomeration for Leaching
Tuesday, August 14, 2007
Here is an oft-repeated definition of the word agglomeration, the topic of this posting: The act or process of collecting in a mass; a heaping together read more »
Agglomeration for Backfill
Friday, August 10, 2007
Here are some abstracts on the topic of agglomerating fine materials destined for the heap leach pad or for backfill underground. read more »
Heap Leach Pad Raincoats
Monday, July 30, 2007
The water balance of a heap leach pad may be detrimentally affected during the rainy season by excessive infiltration from heavy rains. read more »
Wednesday, March 28, 2007
It seems so obvious: most mines involve cutting into rock, and rock is fractured. Therefore the stability and groundwater flow patterns of the mine opening, whether open pit or underground, will be controlled by the fractures. read more »
Monitoring a Leaching Experiment
Wednesday, March 21, 2007
We recently received the following figures from Amado Guzman, Principal Scientist at ARCADIS U.S. Inc. in Tucson, Arizona. The graphs show results from a monitoring system during a leaching experiment. read more »
BioteQ Mexico
Wednesday, February 21, 2007
Technical and financial innovation in one project: Columbia Metals Corporation (also at this link) has contracted with BioteQ Environmental Technologies (also at this link) to construct and operate a copper recovery and water treatment plant read more »
Smith Williams Consultants
Tuesday, January 09, 2007
The quality and quantity of information on consultants’ websites is a constant variable and a never-ending source of amazement and amusement. read more »
Soilvision Systems
Monday, January 08, 2007
Compliments to Soilvision Systems and to MetSoc who mistakenly call their site Heap Leeching—which is really rather different from Leaching. read more »
Cyanide Code Compliance
Tuesday, January 09, 2007
Seldom does reading the news lift my spirits and make me feel warm inside. A happy exception is this announcement [edited and shortened by me]: "The Marigold mine in Nevada read more »
Risk-Based Probabilistic Cover Performance
Monday, January 08, 2007
Little on the web impresses me; but this site does. I am not sure why. There is nothing new. There is nothing particularly profound. All the news and views are readily available elsewhere. read more »
Unsaturated Hydraulic Performance of Mine Waste Facilities
Monday, January 08, 2007
Twenty years ago every mining-geotechnical conference was dominated by papers on slope stability. At the SME in St Louis, March 2006, it seemed as though every mining-geotechnical sessions was dominated by talk of unsaturated flow. read more »