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Challenge deposit, Redwood City, San Mateo Co., California, USAi
Regional Level Types
Challenge depositDeposit
Redwood CityCity
San Mateo Co.County
CaliforniaState
USACountry

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Key
Latitude & Longitude (WGS84):
37° 27' 57'' North , 122° 15' 16'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Emerald Lake Hills4,278 (2011)1.2km
Redwood City85,288 (2017)2.7km
Woodside5,561 (2017)4.0km
San Carlos29,931 (2017)4.6km
Atherton7,167 (2017)5.1km


A former Hg deposit/mine located in the approximate center sec. 36, T5S, R4W, MDM, 2.7 km (1.7 miles) SW of Redwood City (center), just inside the western boundary of the city. Owned by A.F. Oddstad, Jr. First produced in 1955. MRDS database accuracy for this location is not stated. Now part of a housing development.

Mineralization is hosted in Late Jurassic-Late Cretaceous serpentinite of the Franciscan Formation. The ore body is irregular. Serpentine occurs as float. The ore is in slump rock and alluvium. Local alteration includes the silica carbonate alteration of serpentine. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 3 (Coast Ranges and Western Klamath Mountains).

Workings included surface openings with an overall width of 15.24 meters. Operations terminated in 1958 so that the area could be developed into a housing area.

Production statistics: Year: 1962 (period = until 1962): estimated ^6 to 10 pounds (3,614 grams) Hg/metric ton.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


17 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Calcite
Formula: CaCO3
Reference: Dunning, Gail, The Challenge Mercury Deposit, Redwood City, San Mateo County, California., BAM Journal, Vol. 9 No. 1.
Calomel
Formula: (Hg2)2+Cl2
Reference: Rogers, Austin Flint (1911a), Eglestonite from San Mateo County, California: American Journal of Science, 4th. Series: 32: 48-50; Woodhouse, C.D. (1934), A new occurrence of montroydite in California: American Mineralogist: 19: 603-604; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 197.
Cinnabar
Formula: HgS
Reference: Rogers, Austin Flint (1911a), Eglestonite from San Mateo County, California: American Journal of Science, 4th. Series: 32: 48-50; Woodhouse, C.D. (1934), A new occurrence of montroydite in California: American Mineralogist: 19: 603-604; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 197.
Dolomite
Formula: CaMg(CO3)2
Reference: Dunning, Gail, The Challenge Mercury Deposit, Redwood City, San Mateo County, California., BAM Journal, Vol. 9 No. 1.
Edgarbaileyite
Formula: (Hg-Hg)3Si2O7
Reference: Dunning, Gail, The Challenge Mercury Deposit, Redwood City, San Mateo County, California., BAM Journal, Vol. 9 No. 1.
Eglestonite
Formula: (Hg2+2)3OCl3(OH)
Reference: Rogers, Austin Flint (1911a), Eglestonite from San Mateo County, California: American Journal of Science, 4th. Series: 32: 48-50; Woodhouse, C.D. (1934), A new occurrence of montroydite in California: American Mineralogist: 19: 603-604; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 197.
Magnesiochromite
Formula: MgCr2O4
Reference: Dunning, Gail, The Challenge Mercury Deposit, Redwood City, San Mateo County, California., BAM Journal, Vol. 9 No. 1.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Dunning, Gail, The Challenge Mercury Deposit, Redwood City, San Mateo County, California., BAM Journal, Vol. 9 No. 1.
Mercury
Formula: Hg
Reference: Rogers, Austin Flint (1911a), Eglestonite from San Mateo County, California: American Journal of Science, 4th. Series: 32: 48-50; Woodhouse, C.D. (1934), A new occurrence of montroydite in California: American Mineralogist: 19: 603-604; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 197.
Metacinnabar
Formula: HgS
Reference: Dunning, Gail, The Challenge Mercury Deposit, Redwood City, San Mateo County, California., BAM Journal, Vol. 9 No. 1.
Montroydite
Formula: HgO
Reference: Woodhouse, C.D. (1934), A new occurrence of montroydite in California: American Mineralogist: 19: 603-604; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 181.
Mosesite
Formula: (Hg2N)(Cl,SO4,MoO4) · H2O
Reference: The Challenge Mercury Deposit, Redwood City, San Mateo County, California.,Gail Dunning, BAM Journal, Vol. 9 No. 1.
Quartz
Formula: SiO2
Reference: Dunning, Gail, The Challenge Mercury Deposit, Redwood City, San Mateo County, California., BAM Journal, Vol. 9 No. 1.
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10040863.
Terlinguaite
Formula: (Hg2+2)Hg2+2Cl2O2
Reference: Dunning, Gail, The Challenge Mercury Deposit, Redwood City, San Mateo County, California., BAM Journal, Vol. 9 No. 1.
Tiemannite
Formula: HgSe
Reference: Dunning, Gail, The Challenge Mercury Deposit, Redwood City, San Mateo County, California., BAM Journal, Vol. 9 No. 1.
Tunisite
Formula: NaCa2Al4(CO3)4(OH)8Cl
Reference: Dunning, Gail, The Challenge Mercury Deposit, Redwood City, San Mateo County, California., BAM Journal, Vol. 9 No. 1.
Wattersite
Formula: (Hg+2)2Hg2+(CrO4)O2
Reference: Dunning, G.E. et al. (2005): The Clear Creek mine (San Benito County, California): a unique mercury locality. The Mineralogical Record, 36(4), 337-363.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Mercury1.AD.05Hg
Group 2 - Sulphides and Sulfosalts
Cinnabar2.CD.15aHgS
Metacinnabar2.CB.05aHgS
Tiemannite2.CB.05aHgSe
Group 3 - Halides
Calomel3.AA.30(Hg2)2+Cl2
Eglestonite3.DD.05(Hg2+2)3OCl3(OH)
Mosesite3.DD.30(Hg2N)(Cl,SO4,MoO4) · H2O
Terlinguaite3.DD.20(Hg2+2)Hg2+2Cl2O2
Group 4 - Oxides and Hydroxides
Magnesiochromite4.BB.05MgCr2O4
Magnetite4.BB.05Fe2+Fe3+2O4
Montroydite4.AC.15HgO
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Dolomite5.AB.10CaMg(CO3)2
Tunisite5.BB.15NaCa2Al4(CO3)4(OH)8Cl
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Wattersite7.FB.15(Hg+2)2Hg2+(CrO4)O2
Group 9 - Silicates
Edgarbaileyite9.BC.25(Hg-Hg)3Si2O7
Unclassified Minerals, Rocks, etc.
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Mercury1.1.7.1Hg
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Cinnabar2.8.14.1HgS
Metacinnabar2.8.2.3HgS
Tiemannite2.8.2.4HgSe
Group 4 - SIMPLE OXIDES
AX
Montroydite4.2.6.1HgO
Group 7 - MULTIPLE OXIDES
AB2X4
Magnesiochromite7.2.3.1MgCr2O4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 9 - NORMAL HALIDES
AX
Calomel9.1.8.1(Hg2)2+Cl2
Group 10 - OXYHALIDES AND HYDROXYHALIDES
A2(O,OH)Xq
Terlinguaite10.4.2.1(Hg2+2)Hg2+2Cl2O2
Am(O,OH)pXq
Eglestonite10.5.4.1(Hg2+2)3OCl3(OH)
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
AB(XO3)2
Dolomite14.2.1.1CaMg(CO3)2
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Tunisite16a.5.2.1NaCa2Al4(CO3)4(OH)8Cl
Group 29 - HYDRATED ACID AND NORMAL SULFATES
A2B(XO4)2·xH2O
Mosesite29.3.8.1(Hg2N)(Cl,SO4,MoO4) · H2O
Group 35 - ANHYDROUS CHROMATES
Miscellaneous
Wattersite35.4.2.1(Hg+2)2Hg2+(CrO4)O2
Group 55 - SOROSILICATES Si2O7 Groups,Generally with no Additional Anions
Si2O7 Groups, Generally with No Additional Anions with dimeric cations
Edgarbaileyite55.5.1.1(Hg-Hg)3Si2O7
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals for each chemical element

HHydrogen
H Eglestonite(Hg22+)3OCl3(OH)
H Mosesite(Hg2N)(Cl,SO4,MoO4) · H2O
H TunisiteNaCa2Al4(CO3)4(OH)8Cl
H Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
CCarbon
C CalciteCaCO3
C DolomiteCaMg(CO3)2
C TunisiteNaCa2Al4(CO3)4(OH)8Cl
NNitrogen
N Mosesite(Hg2N)(Cl,SO4,MoO4) · H2O
OOxygen
O Wattersite(Hg2+)2Hg2+(CrO4)O2
O MontroyditeHgO
O Eglestonite(Hg22+)3OCl3(OH)
O Terlinguaite(Hg22+)Hg22+Cl2O2
O Mosesite(Hg2N)(Cl,SO4,MoO4) · H2O
O Edgarbaileyite(Hg-Hg)3Si2O7
O CalciteCaCO3
O QuartzSiO2
O DolomiteCaMg(CO3)2
O MagnesiochromiteMgCr2O4
O TunisiteNaCa2Al4(CO3)4(OH)8Cl
O MagnetiteFe2+Fe23+O4
O Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
NaSodium
Na TunisiteNaCa2Al4(CO3)4(OH)8Cl
MgMagnesium
Mg DolomiteCaMg(CO3)2
Mg MagnesiochromiteMgCr2O4
Mg Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
AlAluminium
Al TunisiteNaCa2Al4(CO3)4(OH)8Cl
Al Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
SiSilicon
Si Edgarbaileyite(Hg-Hg)3Si2O7
Si QuartzSiO2
Si Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
SSulfur
S CinnabarHgS
S MetacinnabarHgS
S Mosesite(Hg2N)(Cl,SO4,MoO4) · H2O
ClChlorine
Cl Calomel(Hg2)2+Cl2
Cl Eglestonite(Hg22+)3OCl3(OH)
Cl Terlinguaite(Hg22+)Hg22+Cl2O2
Cl Mosesite(Hg2N)(Cl,SO4,MoO4) · H2O
Cl TunisiteNaCa2Al4(CO3)4(OH)8Cl
CaCalcium
Ca CalciteCaCO3
Ca DolomiteCaMg(CO3)2
Ca TunisiteNaCa2Al4(CO3)4(OH)8Cl
CrChromium
Cr Wattersite(Hg2+)2Hg2+(CrO4)O2
Cr MagnesiochromiteMgCr2O4
MnManganese
Mn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
FeIron
Fe MagnetiteFe2+Fe23+O4
Fe Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
NiNickel
Ni Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
ZnZinc
Zn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
SeSelenium
Se TiemanniteHgSe
MoMolybdenum
Mo Mosesite(Hg2N)(Cl,SO4,MoO4) · H2O
HgMercury
Hg Calomel(Hg2)2+Cl2
Hg MercuryHg
Hg Wattersite(Hg2+)2Hg2+(CrO4)O2
Hg MontroyditeHgO
Hg CinnabarHgS
Hg Eglestonite(Hg22+)3OCl3(OH)
Hg Terlinguaite(Hg22+)Hg22+Cl2O2
Hg MetacinnabarHgS
Hg Mosesite(Hg2N)(Cl,SO4,MoO4) · H2O
Hg Edgarbaileyite(Hg-Hg)3Si2O7
Hg TiemanniteHgSe

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Rogers, Austin Flint (1911a), Eglestonite from San Mateo County, California: American Journal of Science, 4th. Series: 32: 48-50.
Woodhouse, C.D. (1934), A new occurrence of montroydite in California: American Mineralogist: 19: 603-604.
Davis, Fenelon Francis (1955), Mines and mineral resources of San Mateo County, California: California Journal of Mines and Geology (Report 51): 51(4): 413-414.
Holmes, Jr., G.W. (1965), Mercury in California: in: U.S. Bureau of Mines Information Circular 8252.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 181, 197.
Dunning, Gail, The Challenge Mercury Deposit, Redwood City, San Mateo, California., Bay Area Mineralogists Journal Vol. 9, No. 1.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10040863.


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