| 摘要 |
The invention relates to a method and to an apparatus for determining a local mineral grain size of a valuable mineral in a rock of a deposit or an occurrence, where the rock comprises at least one other mineral, and wherein the valuable mineral has a higher density than the at least one other mineral. In the method, the following steps are carried out: - carrying out a drilling operation using a drill (1) in the rock, with cuttings (7, 8) being produced, - forming an aerosol (4) comprising the cuttings and a gas stream, - transferring the aerosol from the drill (1) to at least one air classifier (5), - carrying out stream classification, wherein at least two fractions (6a, 6b, 6c) comprising in each case particles of the cuttings that sink at the same speed are formed and - determining a property of at least one of the fractions (6a, 6b, 6c), which fraction is used as a measure for the local mineral grain size of the valuable mineral in the rock (10a).
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