The new billions of tons "diamants = graphit= carbon" finding opens the new search and answer research
About the source "fossil": biotic / organical or a-biotic/an-organical
about Ferrit to Carbon transmutation ,under high pressure,
about ferrit-magnetism and non magnetism of carbon but graphene-magnetism
about the potential for inexhaustable carbon-sources (recycling !)for the next thousands of years for artificial fuel and gas production,known as synfuels
and as alternative for metalls : full carbon machines instead iron or aluminium and graphene conductors instead copper and aluminiumand cheap HighTemperatureSuperconductor
Deepness of the source is with deep rock smelting technology not more an hindernis/barrier,down to 20 and more kilometers sub-surface mining exploration on earth and later on luna and mars.Plasma smelting and electro-magnetic pulse reaches over 50000 °C equivalent pressure,Wolfram smelting temperature +/-5000 °Cusing standard technology like hyper-sonic and thermobaric devices .