hardcap

hardcap

[′härd‚kap]
(mining engineering)
In bauxite mining, the uppermost foot or two (0.3-0.6 meter) deposit of bauxite; usually serves as a roof during mining.
References in periodicals archive ?
The Cardea 3 mineralization is present at shallow depths within gently undulating laterite profiles that consist of un-mineralized gravel overlying hardcap and bauxite zones.
The Cardea 3 mineralisation is present at shallow depths within gently undulating laterite profiles that consist of un-mineralised gravel overlying hardcap and bauxite zones.
Three core drill holes were made in a gossan (weathered hardcap rock) in the Karet South permit, which intersected nickel-platinum-palladium mineralisation.
Basically, the Hardcap consists of a thin metal jacket, such as might be used to surround a conventional full-jacketed lead bullet, that surmounts a load of either #6 or #9 shot in a standard .
45 Auto barrel at a bit over 1,100 feet per second, the Hardcap shot load has more combined muzzle energy than a standard 230-grain bullet.
Axiom Asia Private Capital Fund II also closed at its hardcap of US$950 million of investor commitments, and commenced investing in January 2009.
4 billion in firm indications, we decided to hardcap the Fund at $1.
Pisolitic, dehydrated hardcap bauxite, often forming a surface hardcap layer 2 metres thick .
This is pisolitic (rounded gravels), iron-enriched, dehydrated bauxite which is cemented into a hardcap layer in places.
The results delivered an 89 per cent conversion of the +55 per cent Fe primary and hardcap mineralisation from Inferred Resources to Indicated Resources.
Results of the resource update exceeded expectations, with an 89 per cent conversion of the +55% Fe primary and hardcap mineralisation converting to Indicated Resources from Inferred Resources.
Of the old laterite hardcaps formerly present above the mottled zone only fragments can still be found, mostly of gravel or stone size, but occasionally with a maximum dimension of more than 0.