The ASIA Miner - Reporting Important Issues to Mining Companies in the Asia Pacific Region
Issue link: http://asiaminer.epubxp.com/i/786114
VDMA 60 VDMA MINING SUPPLEMENT • 2017 one surface mine and two underground mines, recently purchased a CM2H-30 for its Dorstfontein Complex, which operates three continu- ous miner sections. Eickhoff now has a total of 13 continuous miners currently operating in South Africa. Eickhoff continuous miners are also working in China, Russia and Belarus. "There are some interesting developments at the Dorstfontein Complex," said Dr. Uli Lange, deputy director of sales for Eickhoff. "They are running our 30-type continuous miner next to a competitive low-profile prototype machine. The performance of these two ma- chines is being watched closely by all of the underground coal opera- tors in South Africa. This Exxaro trial is very high on our agenda and it looks we're again defining the performance and TCO benchmarks." Eickhoff also had the brand new 36-type continuous miner (3.6-m cutting height) shipped recently to South Africa. The machine weighs 83 metric tons (mt) and has 2 x 180 kW cutting power. "There is great potential for these machines," Lange said. "We took an existing 37 model, which is shorter and lighter, and modified the mainframe making it longer and heavier for the South African market. The coal in this re- gion has a high compressive strength. So, we modified the kinematics of the mainframe as far as the hinge point of the cutter boom, which Eickhoff tests a fully automated low-profile 300 SL shearer loader at its factory in Bochum, Germany. Looking at the low-profile shearer loader from the deck of the armored face conveyor, one can see that Eickhoff has engineered it in such a way that it still has the clearance for high-capacity production. allows the operator to apply more power at the face." Eickhoff's South African continuous miner fleet will significantly grow in 2017 — besides that local success, they see a promising global market for hard coal equipment sales. Advancements in Underground Haulage When it comes to haulage, mines have three options: rail, rub- ber-tired machinery and conveyor system. While the mining indus- try drifted away from rail haulage, Matthias Pütz, sales manager for Schalke Eisenhütte, emphasized it is still a competitive option for transporting ore. Schalke manufacturers locomotives that are cus- tom-designed for underground haulage systems. Schalke is currently negotiating with China on a major pro- ject. The company shipped the first locomotives to Freeport- McMoRan's Grasberg mine in Indonesia in June. Even though the project was delayed, they installed a test track on the surface to get operational approvals. "A total of 10 locomotives were or- dered for Grasberg," Pütz said. "The last two will be produced in the fourth quarter of 2017. When the locomotives begin operating un- derground, they will start with diesel-powered systems until the catenary system is constructed, then they will switch over to electricity." More recently, Schalke has been working with project develop- ers to reinforce rail haulage as an option at the prefeasibility stage. "We have been involved with several scoping studies, including the expansion at Olympic Dam," Pütz said. "They recently decided to go with rail and they have started the second stage of the study." Pütz has also worked on scoping and bankable studies for small- er mining companies. "The Seabridge KSM gold mining project in British Columbia was planning a conveyor system through the moun- tain to the mineral processing plant, but we have now convinced them to use rail haulage, especially as it relates to reduced operating ex- penses," Pütz said. Schalke received its first order in North America last year and it sees a lot of potential in that market. "In May, we received an or- der from Manitoba to replace three old Goodman locomotives with a semi-automated system," Pütz said. Currently, Schake is developing a new locomotive in the 10- to 20-ton range, which could be used for service as well as production. It would be based on Schalke's Modutrac system and has the same parts as a standard locomotive, such as the frame and the driver's cabin. This avoids the long delivery times associated with a cus- tom-made locomotive. For the last two years, Schalke has been working with the Insti- tute for Mineral Resources Engineering at the University of Aachen to develop an inexpensive Excel-based tool to compare the capital and operating costs associated with the three main haulage systems. Pütz said it was nearly finished and are awaiting the results. Energy-efficient Pump Stations for Powered Roof Supports Modern roof supports require higher pressures, bigger cylinder di- ameters, and faster advance rates than their predecessors. All these requirements depend on the high-pressure pumps. At the same time, longwall operators are looking for ways to significantly reduce noise levels and improve energy efficiency. In response, KAMAT has developed a new series of speed-controlled plunger pumps for pressures up to 3,500 bar and motor ratings up to 800 kW. The company combined an upgraded mechanical drivetrain with a variable speed controller, which allows one system to replace multi- ple small pumps with one bigger and well-controllable high-pressure pump or with a master-slave combination.