Means for providing gas seal in production level drift for in si

Method and apparatus for recovery of fluids produced in in-situ

Method and apparatus for retorting oil shale at subatmospheric p

Method for attenuating seismic shock from detonating explosive i

Method for bulking full a retort

Method for closing a drift between adjacent in situ oil shale re

Method for control of geometry of fragmented mass in an situ oil

Method for controlling void fraction distribution in an in situ

Method for controlling void in an in situ oil shale retort

Method for displacing large blocks of earth

Method for establishing a combustion zone in an in situ oil shal

Method for establishing a combustion zone in an in situ oil shal

Method for explosive expansion toward horizontal free faces for

Method for explosively expanding a pillar

Method for explosively expanding a pillar for forming an in situ

Method for forming a module of in situ oil shale retorts

Method for forming an in situ oil shale retort

Method for forming an in situ oil shale retort

Method for forming an in situ oil shale retort in differing grad

Method for forming an in situ oil shale retort with controlled s