$17-41$ Process further or sell, byproduct. $($CMA$,$ adapted$)$ Newcastle Mining Company $($NMC$)$ mines coal, puts it through a one$-$step crushing process, and loads the bulk raw coal onto river barges for shipment to customers.

NMC$$s management is currently evaluating the possibility of further processing the raw coal by sizing and cleaning it and selling it to an expanded set of customers at higher prices. The option of building a new sizing and cleaning plant is ruled out as being financially infeasible. Instead, Amy Kimbell, a mining engineer, is asked to explore outside$-$contracting arrangements for the cleaning and sizing process. Kimbell puts together the following summary: