Is cut and fill mining expensive?
Is cut and fill mining expensive?
Cut and fill is a very expensive mining method, due in large part to the high costs of backfill. This cost can be justified if the ore body is of a particularly high grade. (Cut and fill, Drift and fill) The rock quality designation is a further critical factor.
What is stoping method?
Stoping, in mining engineering, the opening of large underground rooms, or stopes, by the excavation of ore. A common open-stoping method is room-and-pillar mining, in which pillars of ore are left standing to support the rock over a flat-lying ore body.
What is underhand stoping method?
The working of a block of ore from an upper to a lower level; mining downward. The method is particularly suitable for narrow, highly inclined deposits.
How does cut and fill mining work?
The basic concept of cut and fill is straight forward: we mine a portion of the stope, and then we completely backfill the mined portion. The backfill may simply be broken rock, but more likely is a mix of cement and waste rock. We define a stope by driving an upper and lower haulage level.
Is used in shrinkage stoping method?
Shrinkage stoping is a mining method used for steeply dipping, narrower ore bodies with self supporting walls and ore. It is an overhand mining method that relies on broken ore being left in the stope to be used as the “working floor” and to support the walls.
What is purpose of stope surveying?
When mines employ contractors a rapid method of surveying stopes is required so that the pay office can finalise payments at the end of a specific period. Such surveys are also necessary for geological planning purposes and to comply with regulations on keeping mine plans up to date.
How do you calculate cut and fill?
The cut or fill depth for each cell is found by subtracting the average existing level of the cell from the average proposed level. If the resultant depth is positive then this is a fill cell, while a negative value indicates a cut cell.