open-pit mining

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open-pit mining

[¦ō·pən ¦pit ′mīn·iŋ]
(mining engineering)
Extracting metal ores and minerals that lie near the surface by removing the overlying material and breaking and loading the ore. Also known as open-cast mining; opencut mining.
References in periodicals archive ?
Such an emphasis was evident in a Wonnarua Land Council representative's view about the impacts of open-cut mining generally:
The Carache Canyon deposit, in addition to its potential for open-cut mining, also appears to offer potential for underground mining of high-grade zones.
057 opt gold (open-cut) Capital cost (before contingencies): $69 million Capital cost contingencies: $21 million Milling rate: 1,850 tons/day Mill recovery: 85% Underground mining cost: $26/ton Open-cut mining cost: $22/ton (includes overburden stripping) Milling cost: $14/ton Cash operating costs: $134/ounce
It is a large, open-cut mining operation around 40-kilometres long, which was developed in the early 1970s.
The Thaduna mine was discovered by prospectors in 1941, and small-scale production continued until 1953, followed by open-cut mining and trial underground mining intermittently from 1955 to 1971.
Maules Creek is located in New South Wales With 356mt JORC Reserves, capable of supporting a large-scale open-cut mining operation for more than 30 years.
The Feasibility Study was based on open-cut mining to a depth of 50 m of a drill-indicated resource of 325,000 tonnes grading 13.
Mining at Tropicana is based on conventional drill-and-blast, truck-and-excavator, open-cut mining methods carried out by mining contractor Macmahon Holdings.
Tumas Zones 1 and 2 resources were estimated by Multiple Indicator Kriging (MIK) with block support correction, and reflect open-cut mining selectivity.