and 13: Geothermal Resources Council, TRANS.and 11: gravity signal is a rapid but Irreg.and 9: Geothennal Resources Council, TRANS.and 5: Geothermal Resources Council, TRAHS.
and 3: Thompson T OC pH SIO2 Al Fe Mn Ca M.Compared Figure I Generalized map of the Wilbur Mining District, Calif. A chemical analysis by Sunoco Energy Development Company of the well water (Table 1) reported ^11,loo mg/L Cl, 1500 mg/L higher than that reported in White and others (1973). White and others (1973) reported that this well erupted water at IIOOC. GE0THERMC✱ETRY COMPARISONS In 1968 a geothennal well, Wilbur SI, was drilled to a depth of 1300 m approximately 1 km southwest of Wilbur Hot Springs, outside of the major thermal activity. This andesitic basalt is undoubtedly too old to be the present day heat source for the springs in the Wilbur Mining District, but it may indicate that magma or hot rock is still present under the Wilbur Mining District. andesitic basalt in the vicinity of Wilbur Hot Springs. Donnelly (oral communication, 1979) has mapped a dike of 1.6-m.y. All but the Elgin Mine springs issue from the topographic low (see Fig. This could give rise to the peculiar thermal water composition of the four active springs in the Wilbur Mining District: Wilbur Hot Spring, Jones' Fountain of Life, Blanck's Spring, and the Elgin Mine springs. Geological Survey Menlo Park, CA 91025 deep rocks. INTRODUCTION White (1957) suggested that connate water underlies the Wilbur Mining District and that this water Is affected by low-grade metamorphism of J. From the CHij, HjS, and CO2 concentrations in the spring gases at Wilbur Hot Springs and from equations devised primarily for use in steam wells, reservoir temperatures from 227° to 242☌ are calculated. 'For this reason the Mg correction is not considered appropriate and the fluids are estimated to have originated at 230☌.
The magnesium corrected geothermometer gives inconsistent temperatures suggesting that Mg enters the water during its passage from the reservoir to the surface. The Na-fC-Ca geothermometer applied to the four major spring groups in this area gives temperatures ranging from 220 to 2lOOC. 3 Septetrber 1979 A REEVALUATION OF GEOTHERMAL POTENTIAL OF THE WILBUR HOT SPRINGS AREA, CALIFORNIA ABSTRACT In a recent assessment of the geothermal potential of the Wilbur Mining District, it was estimated that a thennal brine at about 150☌ is present at depths less than 3 km. Geol^ertnal Resources Council, TRANSACTIONS, Vol.
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