Topic: Production Spreadsheet
Here's a little spreadsheet we wrote up for [Goldman Sachs] a while back.
It has several features, but the short version is that it helps you coordinate between mining, marketing, and production.
Calculate Ore Requirements to Produce Various Commodities
Calculate Whether to Buy Raw Materials or Commodities from the Market
Calculate the Cost of Producing Items Based on Market Values
Calculate How Many Days of Supply Based on Production Lines and Raw Material/Commodity Reserves
I don't claim that it is exact in all of the calculations, but it does very close estimates.
Edit://Url Removed by GM kokeshi
P.S. Cells colored light purple require manual user input.
Enjoy!