- To participate in the 911Metallurgist Forums, be sure to JOIN & LOGIN
- Use Add New Topic to ask a New Question/Discussion about Geology and Geometallurgy.
- OR Select a Topic that Interests you.
- Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent).
Using Add Reply allows you to Attach Images or PDF files and provide a more complete input. - Use Add Comment = to comment on someone else’s Reply in an already active Topic/Discussion.
Problem - Mine grade control is reconciled back to the mill at the end of month with a single factor, effectively on a pro-rata basis. One of the ore sources commonly returns assays up to 1000g/t. Current procedure is to cut these grades to 100g/t based on the favorable reconciliation back to the block model with like constraints. Grade control is based on grab sampling per 100 tonnes bogged. The mill sample is taken at the cyclone overflow (ie representative of the entire blend). If the grades of the problem source go uncut the ratio (factor) between grade control and mill ends up less than 1 and hence the other sources are downgraded. Our thinking now is that cutting is too final and we are searching other ways to proportion/weight/allocate grade in this situation.