Jennmar Develops Rock Bolting Solutions

Solving the pumpable resin riddle, a new automated resin system should improve safety for hard-rock miners working in difficult geology

It’s no secret. Today’s miners are pursuing metals in deeper underground operations. In the western U.S., gold miners are encountering weak geological conditions. In Canada, some of the mines are so deep that the geology is becoming fluid. While the fluid description might be an exaggeration, what was needed in both cases was a rock bolting solution.

If the miners are going to win the battle in these extreme conditions, they will have to add some new tools to their arsenal. One of the leading ground control suppliers, Jennmar, has recently announced three big developments: the self-drilling, yieldable Multiple Point Anchor (MPA) bolt, an improved inflatable bolt with a corrosion-resistant coating, and a pumpable resin injection system, J-Lok P.

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OCP Bets Big on Rising Phosphate Demand

The Moroccan phosphate producer and world’s leading phosphate rock exporter is investing in new technology to boost its market share and cut its energy bills

As noted in E&MJ’s most recent report on fertilizer raw materials (June 2016, pp.36-43), the world’s phosphate industry has been afflicted with oversupply — particularly of Chinese fertilizer products — with the end result having been a slump in producer prices. Moroccan phosphate rock concentrate is widely used as the benchmark for world prices, based on material containing 32%-33% P2O5 (70% BPL) on the quayside at the country’s export terminals.

Between September 2014 and July 2016, prices remained stable at between $115 and $123/metric ton (mt), a far cry from the peak of $430/mt achieved in September 2008 or the $188/mt in April 2012. Over the past year, however, the trend has been steadily downhill, with the price slipping below $100/mt in January and hitting $96/mt in April.

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Up in the Air

At any mine site with crane-assisted construction or overhead repairs under way, what goes up must come down — at the right time and under complete control. Here’s how the latest crane tech can help ensure that outcome.

When miners say things are “looking up,” it’s unlikely they’re talking about overhead safety awareness. Similarly to many other industrial environments, the usual visual focus in surface mining is largely on what’s in front of or below a worker, and that can be a dangerous fixation: there are often hazards overhead ranging from improperly secured or controlled crane loads to fasteners, tools and parts dropped from height during maintenance and repair activities.

The cost of lifting and overhead-safety-related mishaps can be staggeringly high, from both financial and personnel health aspects. A recent analysis by overhead crane manufacturer Konecranes of Occupational Safety and Health Administration-reported crane incidents in the United States, involving a study tracking 249 incidents over a 10-year period, showed that the average cost to an employer from a major crane-related injury was $200,000. A crane-related fatality costs an average of $4 million.

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Shell-supported Ball Mills: Grinding Technology on a Large Scale

A major ball mill manufacturer presents a persuasive case for choosing this proven — and improved — design over other types

Over many years of use, shell-supported ball mills similar to those pictured above have proven their efficiency and reliability, and a large number of mining projects would not have been viable without them. A large and increasing number of references show that shell-supported ball mills work efficiently and reliably under the most stringent operating conditions. Their design advantages have earned them wide acceptance in the minerals industry, where they are used to grind copper, gold, and silver ores and other hard-rock materials.

Shell-supported mills comprise a steel cylinder, which is attached to the end walls. The mill cylinder is supported on two integral slide rings. Each bearing assembly consists of four to six white metal-coated sliding shoes, allowing the cylinder to rotate.

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