preliminary kimberlite - inferred natural resource, assessment - estimation, to project  - to plan, volume of  - quantity/number, extension - make it larger/n/, immediate area - close or near , considerably - large and important /adv/, expect - wait, mining potential - planned resource, to determine - to control, chairman - person in government, deposit - layer of ore, to drill - to mine with a special device/machine, to increase - to go up, to enhance - to increase, hub and spoke - mining network,

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