The UK's National Coal Board applied similarly complex but also somewhat naive LP models to decisions about which coal mines to close in the 1960s, when the industry was being run down - over 500 closed between 1953 and 1976 when there were still some 300+ mines working.
When I joined them in the mid 1970's the LP approach had been abandoned.
I had a look in the National Archive for more detail but the Operational Research Executive Reports from back then having yet to be digitised.
ORE did continue to use LP and related optimisation models for mining supplies tender allocation - a much better defined problem - into the 1980s.