Day order -

• Day order -An order to buy or sell shares, good only on the day the order was entered.
• Debenture -See bonds.
• Debt financing -Method of raising capital whereby companies borrow money from a lending institution.
• Deck -The area around the shaft collar where men and materials enter the cage to be lowered under ground.
• Decline -A sloping underground opening for machine access from level to level or from surface; also called a ramp.
• Deferred charges -Expenses incurred but not charged against the current year’s operation.
• Depletion -An accounting device, used primarily in tax computations. It recognizes the consumption of an ore deposit, a mine’s principal asset.
• Depreciation -The periodic, systematic charging to expense of plant assets reflecting the decline in economic potential of the assets.
• Development -Underground work carried out for the purpose of opening up a mineral deposit. Includes shaft sinking, crosscutting, drifting and raising.
• Development drilling -drilling to establish accurate estimates of mineral reserves
• Diabase -A common basic igneous rock usually occurring in dykes or sills.
• Diamond -The hardest known mineral, composed of pure carbon; low-quality diamonds are used to make bits for diamond drilling in rock.
• Diamond drill -A rotary type of rock drill that cuts a core of rock that is recovered in long cylindrical sections, two cm or more in diameter.
• Diamond driller -A person who operates a diamond drill.
• Dilution (mining) -Rock that is , by necessity, removed along with the ore in the mining process, subsequently lowering the grade of the ore.
• Dilution (of shores) -A decrease in the value of a company’s shares caused by the issue of treasury shares.
• Diorite -An intrusive igneous rock composed chiefly of sodic plagioclase, hornblende, biotite or pyroxene.
• Dip -The angle at which a vein, structure or rock bed is inclined from the horizontal as measured at right angles to the strike.
• Dip needle -A compass with the needle mounted so as to swing in a vertical plane, used for prospecting to determine the magnetic attraction of rocks.
• Directional drilling -A method of drilling involving the use of stabilizers and wedges to direct the orientation of the hole.
• Discount -The minimum price below the par value at which treasury shares may legally be sold.
• Disseminated ore -Ore carrying small particles of valuable minerals spread more or less uniformly through the host rock.
• Dividend -Cash or stock awarded to preferred and common shareholders at the discretion of the company’s board of directors.
• Dividend claim -Made when a dividend has been paid to the previous holder because stock has not yet been transferred to the name of the new owner.
• Doré bar -The final saleable product of a gold mine. Usually consisting of gold and silver.
• Drag fold -The result of the plastic deformation of a rock unit where it has been folded or bent back on itself.
• Drawpoint -An underground opening at the bottom of a stope through which broken ore from the stope is extracted.
• Drift -A horizontal underground opening that follows along the length of a vein or rock formation as opposed to crosscut which crosses the rock formation.
• Drifter -A hydraulic rock drill used to drill small-diameter holes for blasting or for installing rock bolts.
• Drill-indicated reserves -The size and quality of a potential orebody as suggested by widely spaced drill-holes; more work is required before reserves can be classified as probable or proven.
• Dry -A building where the miner changes into working clothes.
• Due diligence -The degree of care and caution required before making a decision; loosely, a financial and technical investigation to determine whether an investment is sound.
• Dump -A pile of broken rock or ore on surface.
• Dyke -A long and relatively thin body of igneous rock that, while in the molten state, intruded a fissure in older rocks.

Mining Glossary C Mining Equipment China Oxides of the Semimetals and Metals Dolomite Composition, Crystallization & Structure Chemical concentration in Uranium Leaching Methods Magmatic Deposits Rock Structures and Formations Giant Gyratoriy Crushers Azurite – Chessylite, Blue Copper Carbonate Composition & Structure Selection of quarry equipment for efficient crushing practice Operating characteristic of various Types of Rock Crushers Modern Mine Prospectors Fig. 4: Sectional view of fine reduction crusher XANTHATES Payargyrite - Dark Ruby Silver Composition, Crystallization and Structure