40 pounds of amblygonite; also, splendid flake mica has been discovered large enough for commercial purposes. There is a spring near the propertj' on land rented by the owners of the mine. There is also plenty of oak timber for mining purposes. Considerable money has been expended without much result, but for the work actually done on gem pockets, this mine has been a splendid producer.
COLUMBIA MIXE. TOURMALINE.
The Columbia, the oldest tourmaline mine in the State, situated at Coahuila, Riverside County, is about one-half mile northwest of the road leading from Coahuila to the Hemet reservoir, at an altitude of about 5,000 feet. Very little has been done here for over five years, but it was the first tourmaline mine discovered in southern California in 1872, and it has produced a great many beautiful gems. The pockets, however, seem to have been worked out, and nothing important has been found recently.
The ledges of pegmatite are of very fine granite, and both sides of the pocket material seem to be of the same character, thus differing from any other mine in the gem district. Considerable work is proposed in the near future, but the mine is in litigation. There is no water or timber available and the region is barren.
SAN DIEGO COUNTY.
Passing southward from the Coahuila district into San Diego County the localit}' next described lies by itself, about half way to the great Mesa Grande-Pala line of mines. Although not yet an important producer, the occurrence is interesting, as suggesting other possible localities }7et to be discovered in the intervening area.
GEM MIXE XO. 1. TOURMALINE.
Practically no work has been done on this mine since its location in June, 1903. Its altitude is higher than that of any other gem mine in San Diego County, being 5,100 feet above the sea; it is on the top of the divide between San Luis Rev River and Temecula Canyon, and about 1 mile east of tl^e summit of Aguanga Mountain. The average width of the vein is apparent^7 about 4 feet, but it is much broken; both foot and hanging walls are of very hard blue diorite. Great pressure has apparently crushed the ledge, and the pocket layer is found on the top, out of place, between the diorite and the pegmatite: it presents fine, broken crystallizations of orthoclase and albite, in which a red clay is mixed. The tourmaline crystals show much indication of dynamic action, being badly broken and twisted, but they
