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In page Hot dry rock geothermal energy:

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The initial Phase I reservoir was enlarged in 1979 and further flow-tested for almost a year in 1980.[2] Of greatest importance, this flow test confirmed that the enlarged reservoir was also confined, and exhibited a low water loss rate of 6 gpm. This reservoir consisted of the single near-vertical joint of the initial reservoir (which, as noted above, had been flow-tested for 75 days in early 1978) augmented by a set of newly pressure-stimulated near-vertical joints that were somewhat oblique to the strike of the original joint.[citation needed]