Gold Mining Cut Off Grade

A common underground mining method for gold extracts large rectangular boxes of materialcalledstopesxistdif mum cuto grade in underground mine design proc project evaluation conf australasian institute of mining and metallurgyvictoriaaustralia137144

A base case cutoff grade of 04 gt au was used for the mineral resource estimate resources are stated as contained within a conceptual pit shell using a metal price of us1350 per ounce of gold mining costs of us200 per tonne processing plus ga costs of us1540 per tonne 93 recoveries and an average pit slope of 48 degrees

May 12 2006 a cut off grade defines what you will mine for a profit it will vary for every mineral for every location and reflect geological conditions and prevailing metals prices for example you can mine surface gold grading much less than a gram per tonne and make a profit but you would not touch 2 grams per tonne a few kilometres down because it

Average grade the concentration of a mineral in the ore body ie or gt 2 copper and 15 gram per tonne gold strike length the length in which the mineralization is found in the ore body horizontally 500 meters depth the depth in which the mineralization is found in the ore body vertically 200 meters width

If the cutoff grade is not doing this the company cannot achieve its stated aims the breakeven grade the cutoff grade used by most mining companies for the processdo not process decision rightly or wrongly is the breakeven cutoff grade

Jul 16 2015 with 441 gt of gold in reserves fire creek mine owned by klondex mines and located in nevada united states is believed to be the highest grade underground gold mine in the world 2

In a polymetallic mine the cutoff may be expressed as an equivalent grade of the primary metal or by the net smelter return nsr value of the mineralized material that cutoff will be whatever grade is needed to recover enough metal or mineral to pay the cash costs of production

The ivanhoe mines kakula deposit in the drc has returned very high copper grades including 1191 metres true width of 623 copper at a 30 copper cutoff gold one ounce or roughly 30 gramstonne is highgrade and can be expected to move markets in most cases

Cutoff grades for mineral resource reporting going the extra rare earth mile this means knowing the costs and practicalities of mining and processing for a particular product a cutoff grade cog is an industryaccepted standard expression used to determine what part of a mineral deposit to include in a mineral resource estimate mre

Almaden is host to lowsulphidation epithermal mineralization that was the subject of an updated mineral resource estimate using a cutoff grade of 03 gt gold for pit constrained resources as documented in the technical report table 1 table 1 mineral resource statement 1 using a 03 gt gold cutoff for the almaden gold project idaho

Explore gold mine grading how the world gold council defines a highgrade gold mine and where the highest graded mines in the world are found cutoff grade estimation accessed may 8 2020

Cutoff grade is the minimum grade required in order for a mineral or metal to be economically mined or processed material found to be above this grade is considered to be ore while material below this grade is considered to be waste although in a variety of units can be used the cutoff grade

Jun 03 2020 these resources were derived using a cutoff grade of 03 gt gold this article first appeared in the canadian mining journal 2016 0 share sign up for the precious metals digest

Jul 17 2020 a cutoff grade of 215gt has been estimated for the martha underground mineral resource cut off grades based on processing costs of nzd 30tonne general and administration costs of nzd 20tonne and underground mining costs of nzd85tonne martha open pit a cutoff of 05 gt has been estimated for martha open pit gladstone open pit

The cutoff grade that is used by most mining companies for the process do not process decision rightly or wrongly is the breakeven cutoff grade the breakeven grade is defined as the grade at which revenue obtained is equal to the cost of producing that revenue

Almaden is host to lowsulphidation epithermal mineralization that was the subject of an updated mineral resource estimate using a cutoff grade of 03 gt gold for pit constrained resources as documented in the technical report table 1 table 1 mineral resource statement 1 using a 03 gt gold cutoff for the almaden gold project idaho

Cutoff grade determination for the maximum value of a small witstype gold mining operation by rca minnitt synopsis work undertaken in the field of cutoff grade optimization has not advanced much beyond the work undertaken by lane in 1988 his definitive work is based on the calculus of the net present value

Jul 17 2020 a cutoff grade of 215gt has been estimated for the martha underground mineral resource cut off grades based on processing costs of nzd 30tonne general and administration costs of nzd 20tonne and underground mining costs of nzd85tonne martha open pit a cutoff of 05 gt has been estimated for martha open pit gladstone open pit

Cutoff gt indicated inferred tonnage grade gold insitu tonnage grade gold insitu mt gt oz mt gt oz almaden 03 43470 065 910000 9150 056 160000 outcropping lowsulphidation epithermal gold mineralization 70234 m of historic drilling 934 holes extensive metallurgical testwork highgrade feeder mineralization untested

The cutoff grade is the grade of material below which mining is uneconomic calculating the cutoff grade involves completing a minifeasibility study in which all the known and potential costs

Traditional cutoff grades in open pit mining consider a hypothetical case study where an epithermal gold deposit will be mined by an open pit table 1 gives the grade distribution of the material within the ultimate pit limits of this deposit table 2 gives assumed capacities and accepted costs to mine this deposit at 3000 tonsday milling rate

The cutoff grade is around 02gt gold for the 2011 year bolidens aitik mine within the arctic circle in sweden milled 315 million tonnes at a head grade of 024 copper 016gt gold and 20gt silver at the end of 2011 it had reserves of 710 million tonnes at a grade of 025 copper 013gt gold and 16gt silver resources totalled

Feb 21 2020 if the cut or cap is determined to be 10 gt au then all values that exceed 10 gt au will be considered equal to 10 gt au for mine planning and reporting purposes uncapped values will raise the cutoff grade and give a false impression of the total amount of metal available for mining cappingcutting can reduce the total predicted metal

Jun 03 2020 a gold equivalent cutoff of 03 gt was highlighted in the estimate as a possible open pit cutoff whistler raintreeshallow and island mountain and a gold equivalent cutoff of 06 gt was

Jun 24 2020 the gold mineral resources the estimated mineral resources released today at a cutoff grade of 04 gt au are set out below states the report since the last update june 2018 the buckreef shear zone measured mineral resources have more than doubled in terms of tonnage but increased by two and half times in terms of contained ounces

Cutoff gt indicated inferred tonnage grade gold insitu tonnage grade gold insitu mt gt oz mt gt oz almaden 03 43470 065 910000 9150 056 160000 outcropping lowsulphidation epithermal gold mineralization 70234 m of historic drilling 934 holes extensive metallurgical testwork highgrade feeder mineralization untested