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Maple Mining Services (MMS) is an indigenous, heavy-duty equipment and mining services company. MMS provides high quality earth moving equipment for rental to the mining, civil and agricultural sectors in Ghana and West Africa. We provide …
Company Strength: The company possesses 40 years of production experience and three large-scale factories, as well as exports to more than 160 countries. There are abundant hot-selling projects accessible to you.
Our Service: 24/7 online customer service, free customized solution from our engineers, field visiting of China industries, training support after the delivery of goods, 365 days of online after-sales service, and post-maintenance plan.
Cheap and environmentally friendly: Factory-direct sale, fast delivery with guaranteed quality at factory price, in line with the concept of environmental development.
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Nov 24, 2020 · Graphite mining company with high quality resource (large flakes) ... Large flake graphite (greater than 180 microns) hosted in soft rock allows the large flake to be mined cheaply and processed economically without the use of drilling, blasting and crushing. ... Mining and drying equipment
The Mining and Smithing skills received a significant rework on 7 January 2019. As part of the overhaul, most Mining and Smithing-related content was altered, with changes to skill mechanics, the addition of new tiers of ore and Smithing products, and alterations to existing Mining and Smithing related content, such as monster drop tables
The historical name of this claim is the Cunningham Wash Agate and Palm Field. Historically mined for gem quality agates. The mine consists of one large open cut that has been worked at multiple locations. It is located in what appears to be lava rock. Surveyors reported high quality …
SLB-350S is designed for highly efficient tunneling apt for high-speed soft rock excavation with large volume and for powerful medium-hard rock excavation. SLB-350S is equipped with a 350/350kW (rated output) 2-speed motor, which is the most powerful motor manufactured in Japan in this field
113 6.5.6 Logging Rock Core The recovered rock core is logged in the field using at least three measures: (i) rock type, (ii) core recovery, and (iii) rock quality designation (RQD). The rock type should be identified by a qualified engineering geologist or geotechnical engineer familiar with the local geologic setting
Whether you need to excavate, transport or process ore, rock or overburden more efficiently, our comprehensive range of cutting-edge surface and underground mining equipment is designed to increase your productivity and boost your bottom line
Sandvik offers a wide variety of extremely productive and reliable mining jumbos and mining development drill rigs for applications ranging from face drilling for small-scale mine development to large-scale tunneling.
Sandvik longhole drill rigs for underground drilling and bolting are engineered to minimize ore loss and dilution by drilling straight and accurate holes up to 54 meters (177 feet) in length. We offer a comprehensive range of boom types, hydraulic rock drills, carrier size classes and tool selections to ensure optimum hole quality every time
Sandvik articulated in-the-hole (ITH) production drill rigs offer high mobility on a heavy-duty platform. These mining drill rigs are uniquely designed to produce long and straight holes at depths greater than 100 meters (328 feet)
The Sandvik range of rock support drill rigs is designed for a wide array of hard-rock mining operations, tunneling and civil engineering applications. Thanks to on-board cement mixers, cement bag platforms, and optional cement silos and steel strand reels, the rigs can operate autonomously for longer than one shift
Rock excavation tools disintegrate and remove the rock from boreholes and tunnels by four basic mechanisms: thermal spalling, fusion and vaporization, mechanical stresses, and chemical reactions, as shown in Figure 5.1. ''Novel" or "advanced" drilling tools utilize exotic systems such as lasers or electron beams to melt or vaporize rock or explosives, or electrohydraulic discharges, to impact and shatter rock
Thermal spalling drills such as jet-piercing and forced-flame drills heat rocks to 370 to 540°C (700 to 1000°F) to create thermal stresses that spall the rock (Figure 5.2). These devices have limited application because most rocks will not thermally spall (Maurer, 1968, 1980). Melting and vaporization drills utilize high-temperature devices such as lasers or electron beams to melt and vaporize rock (Figure 5.3). These devices have relatively low drilling rates because of the high energy requirements to melt and vaporize rock. Chemical drills utilize highly reactive chemicals such as fluorine to drill rock (Figure 5.4). These drills have found limited application due to high costs and safety problems associated with handling large volumes of highly reactive chemicals. Mechanical stress drills disintegrate the rock by inducing mechanical stresses (Figure 5.5). References for individual novel drills shown in Figures 5.2 to 5.5 (Maurer, 1970) are given at the end of this chapter
Because the cross-sectional area of a tunnel face is 10 to 100 times greater than a typical drillhole, it is very unlikely that thermal spalling, melting, or vaporization drills could be used as the sole rock removal process due to extremely high power requirements and very low penetration rates. Similarly, chemical drills would not be practical for tunneling because of the large volume of highly reactive chemicals required, safety problems, and problems associated with chemical treatment and disposal of contaminated spoils
Most of the advanced thermal and high-pressure jet drills require 10 to 100 times more energy to drill rock than conventional rotary bits (Table 5.1). Low drilling rates and excessive power requirements preclude using these advanced devices as the sole rock removal mechanism except in special applications. Additional R&D, which focuses on the physics of the rock removal process, is needed to reduce the overall energy requirements of these novel drilling techniques
Because of the high power requirements of novel drilling techniques, advances are more likely to be made on combined novel-mechanical drill bits in which the novel devices (e.g., high-pressure water jets) cut narrow slots or "kerfs" in the rock face, thereby weakening the rock and allowing
it to be removed with a conventional bit. These combined systems could yield a two- to fourfold increase in drilling rates (Figure 5.6). A similar system could be used to speed up the advance rate of tunnel boring machines (TBMs; Figure 5.7). Cutting slots in the rock with a novel device weakens the rock and allows conventional cutters to break the rock into larger fragments (Figure 5.8). Figure 5.9 shows an example in which a single slot produced a sevenfold increase in the amount of rock removed by a 75-ft-lb impact. Initial attempts at developing combined novel-mechanical cutters are probably best focused on mining or oil field bits, which are relatively small and inexpensive. Once this technology is developed, it can be scaled up to tunneling and excavation application
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