Start with the bed
The potash story begins with the difference between a geological horizon and an operating plan. Read these essays in sequence to follow that transition.
Dissolving salt turns a bed into a mine plan.
Question the model
Next, examine how sedimentary architecture and geological interpretation shape the resource number a plan depends on.
Sedimentary architecture controls what a resource number means.
Follow the economic boundary
A physical sample and an economic decision answer different questions. This essay connects assays to the material a mine plans to recover.
A cut-off grade is made from assays but is not an assay.
Carry the obligation forward
Finish by reading operating choices through the work they leave for closure.