Jensen Quarry (Oak Quarry), Jurupa, Jurupa Mts, Riverside Co., California, USA

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A former limestone/marble quarry located in sec. 5, T2S, R5W, SBM, 4.7 km (2.9 miles) NW of Jurupa and 4 miles W of Riverside.

First worked during World War I for marble for cement manufacture by Riverside Cement Company (the same company that owned the more famous nearby Crestmore deposit). Closed in 1927; reopened by Riverside Cement Company in 1948; closed again in 1955. Snow Rock Corporation leased the northeastern section of the quarry from the early 1960s until 1971 to mine dolomitic marble (too high in Mg for cement) for granulated roofing material. The last period of commercial activity was 1974-1979, when Riverside Cement Company removed the last of the cement-grade marble. Since 1979, the remaining pegmatites, impure marbles and other contact metamorphic rocks have been of interest only to field collectors.

In the late 1990s, the abandoned quarry was purchased by a golf club and remodelled into a spectacular course, with white marble and pegmatite cliffs as backdrop, now the "Landmark Golf Club at Oak Quarry" (renamed Oak Quarry by the golf club; not known as Oak Quarry during its active extractive years), so field collecting is no longer allowed. But the management are proud of the mineralogical heritage of their site, and the course holes bear fanciful mineral names: Biotite Bluff, Calcite Canyon, Garnet Meadow, Graphite Tower, Gypsum Gully, Limestone Dome, Magnesite Terrace, Marble Ridge, Microlite Ledge, Muscovite Marsh, Opal Outcrop, Pyrite Perch, Quartz Corner, Spinel Slide, Tourmaline Tower, Tremolite Pass, Zircon Tumble. The club house has a glass case displaying Jensen Quarry specimens, donated mainly by local collectors Anne Seminaris Davila and Nick Rose.

Mineral List

Actinolite Albite var: Cleavelandite 'Albite-Anorthite Series' Allanite-(Ce) Almandine 'Apatite' 'Apophyllite' Aragonite Arsenopyrite Augite Axinite-(Fe) Azurite Beryl Beyerite Biotite Bornite Brucite Calcite var: Calcite Satin Spar Chalcocite Chalcopyrite 'Chlorite Group' Chondrodite

Chrysocolla Clinobisvanite Clinohumite Clinozoisite Clintonite Corundum Danburite Diopside Dolomite Dravite Elbaite Epidote Fluorellestadite Forsterite Galena Geikielite Gersdorffite Goethite Goosecreekite Graphite Grossular Gypsum Hambergite 'Hellandite'

'Hornblende' Hydromagnesite Kaolinite Laumontite Ludwigite Magnesite Magnetite Malachite Marialite Microcline Microlite Group Monazite-(Ce) Monticellite Muscovite Nontronite Opal Orthoclase Pargasite Periclase Phlogopite Prehnite Pyrite Pyrochlore Group Pyrrhotite

Quartz var: Smoky Quartz Rutile 'Scapolite' Scheelite Schorl 'Serpentine Group' Sphalerite Spinel Stibiotantalite Stibnite 'Stilbite' 'Synchysite' Talc Titanite 'Tourmaline var: Rubellite' 'var: Verdelite' Tremolite Vanadinite Vesuvianite Wollastonite Xenotime-(Y) Zircon Zoisite var: Thulite

96 entries listed. 79 valid minerals.

References