There are usually three main features about the pilot plant test sample:large mass and large grain size of samples, difficulty to control the samplegrade.
半工业选矿试样一般有三大特点：质量大、矿岩石样粒度大及控制送样品位难度大。
2
"In those cases, if you show the sample to a different pathologist, you often get a different grade," he says.
他说：“在这些情况下，如果你把这些样品展示给不同的病理学家，他们通常会给出不同的分级。”
3
The sampling frequency and the sample size can be adjusted according to the effectiveness of the segregation between the adjacent Grade A and B zones.