• Glossary of Mining Terms - Kentucky Coal Education

    A. Abutment - In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway; and (2) the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid coal ahead of the face and the back ...

    get price
  • Mine Master - Official Site

    The specialty MineMaster are drilling machinery, mining machinery, drill rigs, mining equipment. Today our offer has been extended by LHD's and Dump Trucks.

    get price
  • How to Drill a Well: 10 Steps (with Pictures) - wikiHow

    How to Drill a Well. A well is a man-made hole dug into the ground to get to a liquid. The most commonly sought liquid is water: About 97 percent of the world's fresh water is found in underground aquifers, and some 15 million American...

    get price
  • Homemade Leg Press Machine - Instructables

    Hello! This instructable will show how to make a Leg Press exercise machine capable of over 200lb resistance. It is fairly easy and simple to make, not to mention...

    get price
  • Bertha (tunnel boring machine) - Wikipedia

    Bertha was designed and manufactured by Hitachi Zosen Sakai Works of Osaka, Japan, and is the world's largest earth pressure balance tunnel boring machine, at a cutterhead diameter of 57.5 feet (17.5 m) across.

    get price
  • J. & H. Drilling Co., Inc. - Home

    Environmental Drilling Geotechnical Drilling Direct Push Air knife Well Development Underground Utility Locating, Well Permits Los Angeles County Orange County SBE DBE MBEJ.

    get price
  • Home Page [underground.com]

    24 hr phone/email break down and parts support, as well as 'technical and reliability' reports to keep technicians up to date with common reliability issues and new maintenance strategies.

    get price
  • Directional boring - Wikipedia

    Directional Boring, often undifferentiated from Horizontal Directional Drilling (HDD), is a minimal impact trenchless method of installing underground pipe, conduit, or cables in a relatively shallow arc or radius along a prescribed underground bore path by using a surface-launched drilling rig.

    get price
  • Mining - Underground mining | Britannica.com

    Mining - Underground mining: When any ore body lies a considerable distance below the surface, the amount of waste that has to be removed in order to uncover the ore through surface mining becomes prohibitive, and underground techniques must be considered.

    get price
  • 200 underground cities - HEARTCOM

    Tunnels under the USA and Deep Underground Military Bases (DUMBS) See also, Underground Facilities - Bases - Tunnels So the elite are keeping silent about Planet X coming but have been busy building underground cities and interconnected tunnels - hmmmmmm?

    get price
  • Mining | Britannica.com

    Mining: Mining, process of extracting useful minerals from the surface of the Earth, including the seas. A mineral, with a few exceptions, is an inorganic substance occurring in nature that has a definite chemical composition and distinctive physical properties or molecular structure.

    get price
  • Project Camelot | Underground bases and tunnels

    The first section of this page was written by Phil Schneider:. Photo of United States Air Force tunnel boring machine at Little Skull Mountain, Nevada, USA, December 1982.

    get price
  • ProVision Machine Guidance System - Modular Mining Systems

    ProVision Shovel . With the ProVision Shovel system, operators are actively guided by high-precision GPS to dig the right material, keep the designed bench grade, respect dig limits, and work within the machine's optimal operating specifications.

    get price
  • Secret Underground Bases - Cosmic Conspiracies

    Underground Bases We recently came across a very interesting list from a book called Entrances to Subterranean Tunnels "Underground Alien Bases" (UAB) ISBN: 0-938294-92-X (UAB) which purports to list

    get price
  • Sandvik Mining and Rock Technology - Mining Equipment, Parts ...

    Sandvik rock drills or rotation heads - depending on application - are the heart of any rock drilling equipment. As the leading supplier of rock drill technology in the world, we design, produce and deliver these core components and their spare parts for underground drilling and surface drilling.

    get price
  • S36 drifter style rock drill designed for deep hole drilling ...

    Drifter style rock drill designed for deep hole drilling in both surface and underground applications when mounted on suitable feed systems.

    get price
  • Fiskar's Hand Drill 1/4 in. Carded - Ace Hardware

    Ideal for drilling on the go no cords or batteries needed. Smooth operating gear system is completely enclosed in a durable ABS housing. Used for quick jobs.

    get price
  • DISPATCH Underground Fleet Management System | Modular Mining ...

    DISPATCH Underground | Modular Mining's DISPATCH UG fleet management system optimizes underground mines with real-time data & equipment activity management.

    get price
  • Underground Construction (Tunneling)

    Underground Construction (Tunneling) U.S. Department of Labor Elaine L. Chao, Secretary Occupational Safety and Health Administration John L. Henshaw, Assistant Secretary

    get price
  • The Combs Group Inc. - Phillips Machine Services, Inc.

    Our Harrogate, TN facility offers: Machining and Rebuilding – Our facilities are staffed with certified and highly skilled Machinists that operate a variety of precise, machining equipment.

    get price
  • Sinocoredrill - Official Site

    Sinocoredrill Group Co.,Ltd is best Core Drill Rig, Horizontal Directional Drilling Rigs and CBM Drilling Rig supplier, we has good quality products & service from China.

    get price
  • Flotec FPDMP21SA-P2 Self Priming Drill Pump - amazon.com

    I purchased this pump to drain out a few gallons of water at the bottom of our hot tub but it was pretty worthless. I originally had it on a cordless drill but the drill required greater RPMs so I hooked it to a power drill that had more than enough RPM to do the job but it just did not drain the way I had hoped and was way to slow.

    get price