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Oceanview Mine (Oceanview adits; new Oceanview workings), Elizabeth R. Mine (Hazel W. claim), Chief Mountain, Pala, Pala District, San Diego Co., California, USA

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Latitude & Longitude (WGS84): 33° 23' 24'' North , 117° 3' 6'' West
Latitude & Longitude (decimal): 33.39000,-117.05167
GeoHash:G#: 9muvbqmwf
Köppen climate type:Csa : Hot-summer Mediterranean climate


Setting:
The Oceanview mine is the metonymical name given to the most recent adits and associated underground workings located on the western downhill portion of the unpatented Elizabeth R. lode mining claim, at an elevation of approximately 1287 feet AMSL.

History:
Work began around September of 2000 developing the main adit that now serves as the lowest underground haulageway for mechanized mining, which runs east for approximately 60 feet, then follows the Oceanview pegmatite[1] laterally along strike, as it meanders south to southwestward for a distance of over 400 feet.

Underground work progressed until a large pocket was discovered September 22, 2007, located up-dip about mid way along the haulage drift. Over several months, this zone of mineralization produced several notable specimens of fine pastel pink, blue and bicolor beryl crystals; primarily occurring as tea-cup sized singles and smaller clusters, in association with darkly colored tourmaline, and some attractively arranged on matrices of cleavelandite. This pocket was referred to by the miners as the "49'er pocket", in homage of the mine owner Jeffrey Swanger's coinciding 49th birthday.

The beryl recovered from this zone were typical in form and color as those recovered further up-dip in the same pegmatite by Roland Reed. Other minerals found in these workings included small amounts of pale blue and dark purple to black tourmalines or schorl, spodumene, microcline, muscovite, montmorillonite and quartz. Some large gem-quality smoky citrine quartz crystal points and clusters were produced, many weighing up to several hundred pounds each.

Around November of 2009, a new adit was completed approximately 200 feet south of the first adit driven by Swanger in 2000. This new portal intersected the existing underground haulageway, facilitating improved removal of waste rock generated during mining operations, and increased underground ventilation control.

A crew of 5 or so miners continued to work intermittently, concentrating efforts to extend the underground workings into the paystreak discovered earlier by Reed, located approximately 100 feet up-dip from Swanger's adits, ultimately developing a series of drifts, declines and stopes along the trend of lithia mineralization. The upper zone of lithia mineralization exploited by Reed is characterized as massive purple lepidolite, sometimes associated with sprays of pink tourmaline and anhedral spodumene.

On December 3rd, 2009, another bonanza pocket was discovered, with extraction work performed by Jeffrey Swanger, Steve Carter and Mark Mauthner. This basketball-sized pocket produced several deep purple and lavender kunzite crystals, the largest measuring approximately 7.4cm wide, being doubly terminated, along with many fine gem-quality green and bicolored spodumene crystal laths and shards. Nearly all of the kunzite recovered exhibited strong green to purple trichroism. Other accessory minerals recovered adjacent to this pocket included several small pale blue to dark blue-capped tourmaline crystals, lepidolite and cleavelandite.

Underground work continued along the zone of lithia mineralization, which led to the discovery of additional kunzite pockets in the spring of 2010. In this area, dubbed the "Big Kahuna" zone in honor of Swanger's father, hundreds of kilograms of gem spodumene were produced, including one large crystal lath measuring approximately 21cm tall, and weighing nearly one kilogram. Minor amounts of green, blue and pink tourmaline were also discovered, including some fine bicolor pink and green pencils. The largest reported tourmaline found measured approximately 15cm tall and 3-4cm wide. Additionally, several beryl specimens were also discovered, although beryl was notably rare in this zone. One tabular morganite crystal recovered measured 7cm across, associated with a small "blue-cap" pink tourmaline.

In December of 2010, another large kunzite pocket was discovered down dip from the Big Kahuna zone, and thus named the "Big Kahuna II". Although not as productive in comparison to the sheer volume of material produced from the first pocket, the color of this spodumene was generally a more deeply saturated hue, and exhibited strong pleochroism. Several deep colored pink and cranberry red color-zoned tourmaline specimens were also found, some associated with a matrix of albite and lepidolite. Adjacent satellite pockets produced specimens of citrine and smoky quartz, some so deeply colored that they appeared black or otherwise opaque.

Footnote:
1.The Oceanview pegmatite dike outcrops along the western endline of the patented Oceanview lode mining claim, and along the eastern endline of the Elizabeth R. lode mining claim, and dips down beneath the surface towards the west, and slightly southwards. The continuity of the deposit has proven remarkably homogeneous along strike and dip, with most of the minerals recovered consistently similar in character and formation.


Mineral List


13 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Cretaceous
66 - 145 Ma



ID: 2703489
Gabbro, undivided

Age: Cretaceous (66 - 145 Ma)

Description: Massive, coarse-grained, dark-gray and black biotite-hornblende-hypersthene gabbro.

Reference: Kennedy, M.P., and S.S. Tan. digital prep. by Bovard et al. Geologic Map of the Oceanside 30’ x 60’ Quadrangle, California. California Department of Conservation California Geological Survey. [131]

Cretaceous - Triassic
66 - 252.17 Ma



ID: 2776321
Mesozoic gabbroic rocks, unit 2 (undivided)

Age: Mesozoic (66 - 252.17 Ma)

Stratigraphic Name: Cuyamaca Gabbro; Elk Creek Gabbro; Gold Park Gabbro-Diorite; San Marcos Gabbro; Summit Gabbro

Description: Gabbro and dark dioritic rocks; chiefly Mesozoic

Comments: Mostly small exposures of gabbro and diorite scattered in western Klamath Mts., Sierra Nevada, Coast Ranges, Mojave Desert, and Peninsular Ranges

Lithology: Major:{diorite,gabbro}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Cretaceous
66 - 145 Ma



ID: 3186295
Mesozoic intrusive rocks

Age: Cretaceous (66 - 145 Ma)

Lithology: Intrusive igneous rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



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References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Osborn, P. (2007), Personal communication between Phil Osborn of Hemet and Scott L. Ritchie; Overview of work including adit development, petrology, lithology, bonanza pocket zone encountered, and gemstones recovered during the Oceanview mining operation. Feb.
Stephenson, J. (2007), Pala District Opens Wide: Oceanview Mine Strikes It Big. Mineral News: Pala International, Fallbrook, CA. December.
Stephenson, J. (2008), Pala District Opens Wider: Oceanview Mine Strikes It Big. Gem News: Pala International, Fallbrook, CA. January 16th.
Mauthner, M. H. F. (2008), The Forty-niner Pocket, Oceanview Mine, Pala District, San Diego County, California. Rocks & Minerals 83(4): 292-297.
Mauthner, M. H. F. (2009), Description of kunzite discovery from the Oceanview Mine, Pala District, San Diego County. Mindat.org photo gallery, December 12th.
Mroch, W. (2009), The Big Kunzite Find of 2009. Gem and Mineral Exploration Company. Cypress, Orange County, California. December 28th.
Fisher, J. (2011), Mines and Minerals of the Southern California Pegmatite Province. Rocks & Minerals: 86(1): 14-34.
Mauthner, M. H. F. (2011), Recent Updates from the Oceanview Mine. The Vug: 4(1): 41-43.
Mauthner, M. H. F. (2011), Recent Finds at the Oceanview Mine, Pala District, San Diego County, California. Rocks & Minerals 86(1): 41-47.

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