If everyone demands hard cash and there is no banker around, the project doesn't get going. You mentioned a "community" being involved in this. Presumably the "community" has a local economy that provide some of the services these contractors would use their cash for, again in kind or by accepting the scrip issued by the mining partnership as a local currency. And once we're talking about it in these terms, what fraction of the community's GDP is 100 million, in your example? En un viejo país ineficiente, algo así como España entre dos guerras civiles, poseer una casa y poca hacienda y memoria ninguna. -- Gil de Biedma
Presumably the "community" has a local economy that provide some of the services these contractors would use their cash for, again in kind or by accepting the scrip issued by the mining partnership as a local currency. Some, but certainly not all.
And once we're talking about it in these terms, what fraction of the community's GDP is 100 million, in your example? What do you think? A city of 30-35.000 maybe, so a GDP around 1 billion euros? Peak oil is not an energy crisis. It is a liquid fuel crisis.