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Bedrock
Besides sampling, it is completely essential that holes be dug to bedrock or the bottom of the deposit. This is needed for two motives which include:
Almost all the ore bodies in most cases have the highest values at the bottom.
The high values which are present at bedrock are in many cases included in the uneven surface at the bedrock. Consequently, this surface needs to be excavated by the dredge, if achievable.
A sample of this bedrock is essential to settle on if the dredge is able to excavate the bedrock. Elevation differentials needs to be set if they exist. If noteworthy elevation differentials take place, a methodical study of the bedrock condition should be done to develop a suitable mining plan. Exploration of bedrock elevation might reduce the potential loss of high values. Assuming the full testing of the ore body has been done and is satisfactory, a particular dredge can then be chosen for the project.
The size of the dredge will be determined by dimension of the material, volumetric necessities of the processing plant, digging depth, and the distance between the mining site and the processing system. The processing system needs to be as close to the dredge as possible in order to reduce the horsepower and pipeline handling that occurs from long pipeline distances.
As mentioned before, after all these conditions have been thoroughly looked into, the right dredge size can be resolute.
