Last week I needed to brush up on stability analysis of waste rock dumps or embankments as they are sometimes called. I went to the obvious sources: EduMine. I opened the course Design and Operation of Large Waste Dumps by Tim Eaton and Scott Broughton. In the section on Analysis they present a masterful description of the various failure modes and how to analyse them. They add this on probability of failure: (more…)
Archive for the ‘Waste Rock’ Category
Posted in acid mine drainage, brandy, British Columbia, Cyanide, Diamond, Heap leach, Mining history, Open Pit, People, Tailings, Waste Rock, tagged cannon mine, don moore, geochemistry, Greens Creek, kimberlite petrology, mt polley, ned larson, rick call, risk, UMTRA on February 13, 2015 | 9 Comments »
This week I had reason to go back and re-read three papers I co-authored in the early 1980s. It is surprising how far advanced we were then, and how little things have changed, or how little of what did has become standard practice. The first paper is at this link. Rick Call was the lead on the work we describe in this paper. He was a large buff man, with an enormous beard, a perpetual pipe, and a totally irreverent attitude towards authority. He sent Ned Larson and me to Texas, where we sweated through the heat to get the data. Then back to Tucson to do the calculations. I recently reconnected with Ned who is now in Las Vegas and the grandfather of sixteen grandchildren. He is still with the U.S. Department of Energy which he joined after working with me for five years on the UMTRA Project in Albuquerque. He is a great engineer, as was Rick. (more…)
The final keynote speech at the conference on Tailings and Mine Waste was from Craig Benson. He talked about mine waste facility covers. He has promised me a pdf of his talk. But in the meantime there are many documents by him and his coworkers readily available on the web that deal with much the same material as was in his presentation. (more…)
Posted in consulting, Geosynthetics, Geotechnical, Heap leach, Reclamation, Tailings, Waste Rock, tagged cover, erosion, geosynthetic, mine closure, Reclamation, rock cover, slope stability on July 2, 2014 | Leave a Comment »
The exterior surface of most tailings, waste rock, and heap leach facilities include:
- A top deck which is the flatter surface that forms the top surface of the facility. This is usually sloped at between one and five percent, primarily to promote runoff.
- The sideslopes which are easily covered if they are inclined at about five horizontal to one vertical (5H:1V) but which in practice may be as steep as 1.4H:1V.
Covers on the top deck are less subject to erosion, slope instability, and soil creep than covers on sideslopes. Thus different covers may be appropriate at the same facility on the top deck as compared to the sideslopes. Here are a few idle thoughts on sideslope covers for mine waste facilities. (more…)
Posted in About the news, brandy, British Columbia, consulting, decomissioning, environmental, Human relations and mining, mining, Tailings, Waste Rock, tagged infome. edumine, mine closure, pascua lama, weed on April 26, 2014 | 2 Comments »
Next week in Brazil is the first InfoMine conference on Mine Closure. About ninety folk will gather to discuss mine closure in Brazil and South America. I have read the papers: not a lot of fascination to the rest of us. Mostly about the theory and postulated future of mine closure laws & regulations in countries that currently have none. The middle of May, I present an EduMine webcast on Mine Closure. In the webcast I will review the best few papers from the Brazil conference. I will also present current case histories of mine closure that I am working on. And I will go through the theory and practice and issues of mine closure in general. Come join me. (more…)
Posted in About the news, British Columbia, California, consulting, Enviromental, environmental, Jobs and Salaries, Oil sands, People, Reclamation, Tailings, Waste Rock, tagged advanced tailings, christian kujawa, conference, edumine, Ian Hutchison, lawrence charlebois, Myra Falls, nyrstar, Paterson and Cooke, robert cooke, slr, Tailings, webcast on April 22, 2014 | Leave a Comment »
There is still time to join us for the upcoming EduMine webcast Advanced Tailings and Mine Waste Facility Design, Operation, and Closure. Here is the link to the course. Even if you have taken other courses before conferences, or the other EduMine webcast on Introduction to Tailings, or our previous Advanced Tailings courses, I know you will find interesting and exciting information, perspectives, practices, and case histories in this new course. (more…)
Posted in acid mine drainage, brandy, British Columbia, consulting, Geosynthetics, North America, Oil sands, People, Reclamation, Tailings, Waste Rock, tagged closure, cold cover, et covers, fmea, goesynthetics in mining, Gord McKenna, justin straker, mike o'kane, UMTRA, valley and ridge covers on April 8, 2014 | Leave a Comment »
Spent today in a course on Covers in Cold Climates. The course is part of the seminar to follow tomorrow and Wednesday on the same topics. Arranged by InfoMine, it is being held in Whistler, which is a nice, but not spectacular place to have a conference—I prefer Banff or Vancouver. For the Fairmont Chateau Whistler is a pale reflection of those other grand hotels with the Fairmont name: a bland and ugly exterior that replicates in cheap detail the features of the hotel in Vancouver that it tries to emulate. (more…)