Introduction

Bulk sampling, the costly process of taking very large samples, is part of the general procedure for the exploration and evaluation of a mineral deposit.

Often the bulk sample will be a composite of material from development drifts and raises. Ideally, drift rounds or other portions should be selected from geological mapping and prior sampling, handled separately, and should be stored temporarily on a pad for sampling if not directly processed. The bulk sample will consist of these components and will take into account the geological continuities. The appropriateness of the bulk sample will be related to its source, to the variability of the deposit, to the deposit morphology, and to anticipated problems. The final objective is to obtain the quantitative information required for the quantitative evaluation of the deposit in a formal feasibility study; the objective is a production decision that leads to a profitable operation. 

This course provides a comprehensive introduction to the topic, including the application of bulk sampling in a project exploration / evaluation context, the nugget effect and other statistical issues, planning a bulk sampling program, grade verification and metallurgical testing. 

Learning Outcomes

1. Recognize the application and objectives of bulk sampling techniques in the exploration and evaluation of mineral deposits. 
2. Recognize the nugget effect and its impact on grade variability. 
3. Identify and apply the methods and techniques that aid in optimizing sampling procedures and reducing sampling errors. 
4. Identify and apply the unit volume approach to bulk sampling. 
5. Plan a bulk sampling program in terms of sample size, grade variability and sample storage, treatment, monitoring and feedback of results. 
6. Apply bulk sampling procedures for the objectives of grade verification or metallurgical testing.

Duration: 12 Hours

Category: Exploration

Level: Intermediate