Process for the gasification of coal in situ

Production of shale oil by in-situ retorting of oil shale

Recovery of fluid fuels by in-situ retorting of carbonaceous dep

Recovery of liquid and gaseous products from an in situ oil shal

Recovery of magnesia from oil shale

Recovery of magnesia from oil shale

Recovery of shale oil and magnesia from oil shale

Removal of pillars from a void for explosive expansion toward th

Rock bolting techniques for forming an in situ oil shale retort

Sealing an underground coal deposit for in situ production

Secondary oil shale recovery technique

Situ retort with high grade fragmented oil shale zone adjacent t

Slurry backfilling of in situ oil shale retort

Stability control in underground workings adjacent an in situ oi

Staggered array of explosives for fragmented oil shale formation

Subsidence control at boundaries of an in situ oil shale retort

Subterranean in situ oil shale retort and method for making and

Surface and subsurface hydrocarbon recovery

System and method for enhancing permeability of a...

System for fuel and products of oil shale retort