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Denny Gulch, Denny Mountain, Snoqualmie Mining District, King County, Washington, USAi
Regional Level Types
Denny GulchMine
Denny MountainMountain
Snoqualmie Mining DistrictMining District
King CountyCounty (Historical)
WashingtonState
USACountry

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Latitude & Longitude (WGS84):
47° 25' 54'' North , 121° 27' 9'' West
Latitude & Longitude (decimal):
47.43193,-121.45274
GeoHash:
G#: c23tu68z4
GRN:
N32W60
Type:
Mine
KΓΆppen climate type:
Csb : Warm-summer Mediterranean climate
Nearest Settlements:
PlacePopulationDistance
Snoqualmie Pass311 (2011)5.9km
Tanner1,018 (2011)22.6km
Riverbend2,132 (2011)22.7km
Wilderness Rim1,523 (2017)23.8km
North Bend6,679 (2017)26.1km
Mindat Locality ID:
10550
Long-form identifier:
mindat:1:2:10550:2
GUID (UUID V4):
d157f1d2-9ead-4efd-82b0-cee2afbfb4a8
Other/historical names associated with this locality:
Denny Mine; Denny Company Mine; Denny Creek; Rockhound Gulch


The canyon off of denny creek affectionately known as "rockhound gulch" is one of the more well known mineral collecting localities in Washington. It is a skarn formed by the intrusion of the snoqualmie batholith into sedimentary rocks.


To reach Rockhound Gulch, take the Melakwa Lakes trail no. 1014. You will start on the west side of Denny Creek, cross to the east side via a large hewn log bridge, cross back to the west side where the trail descends a bank to a rock crossing. After this second crossing, the trail switchbacks up a hill, then comes back close to the creek canyon. At this point you will have a wide view of the cliffs of Low Mountain (5000 feet) on your left. Just after you see this view, the trail turns left, and a poor trial goes off the right side down into Denny Creek canyon, across a flat rock outcrop above a waterfall, to a rocky-bottomed canyon up the side of Denny Mountain. This is Rockhound Gulch.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

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


Mineral List


12 valid minerals. 1 erroneous literature entry.

Detailed Mineral List:

β“˜ 'Amphibole Supergroup'
Formula: AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
β“˜ 'Amphibole Supergroup var. Byssolite'
Formula: AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
β“˜ Calcite
Formula: CaCO3
β“˜ 'Chlorite Group'
β“˜ Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
β“˜ Diopside
Formula: CaMgSi2O6
Habit: blocky crystals to .75 inches
Colour: greenish
β“˜ Epidote
Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Habit: crystal sprays
Colour: dark Green
β“˜ Goethite
Formula: Ξ±-Fe3+O(OH)
β“˜ Grossular
Formula: Ca3Al2(SiO4)3
β“˜ Hematite
Formula: Fe2O3
Habit: specular
Description: Forms platy aggregates, sometimes as terminated rosettes. Often, entire pockets are filled with hematite.
β“˜ 'K Feldspar'
β“˜ 'K Feldspar var. Adularia'
Formula: KAlSi3O8
β“˜ Lepidocrocite
Formula: γ-Fe3+O(OH)
Description: The strawberry and black inclusions in the amethyst scepters are hematite. No lepidocrocite has ever been found here.
β“˜ Malachite
Formula: Cu2(CO3)(OH)2
β“˜ Opal
Formula: SiO2 · nH2O
β“˜ Pyrite
Formula: FeS2
Description: Occurs (rarely) as unoxidized cubes, but more commonly as goethite pseudomorphs.
βœͺ Quartz
Formula: SiO2
Habit: Frequent Normal Prisms some with heamtite inclusions to a few cm. Spectacular large rare Japanese Twins to over 30 cm ear to ear
Colour: colourles to red from inclusions
Fluorescence: none
Description: The normal prisms are common but not the killer twins
βœͺ Quartz var. Amethyst
Formula: SiO2
Habit: doubly terminated scepters on clear quartz prisms to a few cm
Colour: strawberry purple
Description: Hematite inclusions in the Amethyst give the strawberry colour.
References:
UBC specimen
β“˜ Scheelite
Formula: Ca(WO4)

Gallery:

(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)β“˜ Epidote
Ca3Al2(SiO4)3β“˜ Grossular
Fe2O3β“˜ Hematite
SiO2β“˜ Quartz
SiO2β“˜ Quartz var. Amethyst

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
β“˜Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
β“˜Goethite4.00.Ξ±-Fe3+O(OH)
β“˜Hematite4.CB.05Fe2O3
β“˜Quartz4.DA.05SiO2
β“˜var. Amethyst4.DA.05SiO2
β“˜Opal4.DA.10SiO2 Β· nH2O
β“˜Lepidocrocite ?4.FE.15Ξ³-Fe3+O(OH)
Group 5 - Nitrates and Carbonates
β“˜Calcite5.AB.05CaCO3
β“˜Malachite5.BA.10Cu2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
β“˜Scheelite7.GA.05Ca(WO4)
Group 9 - Silicates
β“˜Grossular9.AD.25Ca3Al2(SiO4)3
β“˜Epidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
β“˜Diopside9.DA.15CaMgSi2O6
β“˜Chrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 Β· nH2O, x < 1
Unclassified
β“˜'K Feldspar'-
β“˜'var. Adularia'-KAlSi3O8
β“˜'Chlorite Group'-
β“˜'Amphibole Supergroup'-AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
β“˜'var. Byssolite'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2

List of minerals for each chemical element

HHydrogen
Hβ“˜ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Hβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Hβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Hβ“˜ GoethiteΞ±-Fe3+O(OH)
Hβ“˜ Lepidocrociteγ-Fe3+O(OH)
Hβ“˜ MalachiteCu2(CO3)(OH)2
Hβ“˜ OpalSiO2 · nH2O
Hβ“˜ Amphibole Supergroup var. ByssoliteAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
CCarbon
Cβ“˜ CalciteCaCO3
Cβ“˜ MalachiteCu2(CO3)(OH)2
OOxygen
Oβ“˜ K Feldspar var. AdulariaKAlSi3O8
Oβ“˜ Quartz var. AmethystSiO2
Oβ“˜ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Oβ“˜ CalciteCaCO3
Oβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Oβ“˜ DiopsideCaMgSi2O6
Oβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Oβ“˜ GoethiteΞ±-Fe3+O(OH)
Oβ“˜ GrossularCa3Al2(SiO4)3
Oβ“˜ HematiteFe2O3
Oβ“˜ Lepidocrociteγ-Fe3+O(OH)
Oβ“˜ MalachiteCu2(CO3)(OH)2
Oβ“˜ OpalSiO2 · nH2O
Oβ“˜ QuartzSiO2
Oβ“˜ ScheeliteCa(WO4)
Oβ“˜ Amphibole Supergroup var. ByssoliteAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
FFluorine
Fβ“˜ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Fβ“˜ Amphibole Supergroup var. ByssoliteAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
MgMagnesium
Mgβ“˜ DiopsideCaMgSi2O6
AlAluminium
Alβ“˜ K Feldspar var. AdulariaKAlSi3O8
Alβ“˜ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Alβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Alβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Alβ“˜ GrossularCa3Al2(SiO4)3
Alβ“˜ Amphibole Supergroup var. ByssoliteAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
SiSilicon
Siβ“˜ K Feldspar var. AdulariaKAlSi3O8
Siβ“˜ Quartz var. AmethystSiO2
Siβ“˜ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Siβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Siβ“˜ DiopsideCaMgSi2O6
Siβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Siβ“˜ GrossularCa3Al2(SiO4)3
Siβ“˜ OpalSiO2 · nH2O
Siβ“˜ QuartzSiO2
Siβ“˜ Amphibole Supergroup var. ByssoliteAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
SSulfur
Sβ“˜ PyriteFeS2
ClChlorine
Clβ“˜ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Clβ“˜ Amphibole Supergroup var. ByssoliteAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
KPotassium
Kβ“˜ K Feldspar var. AdulariaKAlSi3O8
CaCalcium
Caβ“˜ CalciteCaCO3
Caβ“˜ DiopsideCaMgSi2O6
Caβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Caβ“˜ GrossularCa3Al2(SiO4)3
Caβ“˜ ScheeliteCa(WO4)
TiTitanium
Tiβ“˜ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Tiβ“˜ Amphibole Supergroup var. ByssoliteAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
FeIron
Feβ“˜ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Feβ“˜ GoethiteΞ±-Fe3+O(OH)
Feβ“˜ HematiteFe2O3
Feβ“˜ Lepidocrociteγ-Fe3+O(OH)
Feβ“˜ PyriteFeS2
CuCopper
Cuβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Cuβ“˜ MalachiteCu2(CO3)(OH)2
WTungsten
Wβ“˜ ScheeliteCa(WO4)

Other Regions, Features and Areas containing this locality

North America
North America PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

[1]Jackson, R., Jackson, K.L. (1974) The Rockhound's Guide to Washington: Vol.1, Jax Products, 48 pages.
Cannon, Bart (1975) Minerals of Washington. Cordilleran, Mercer Island, WA.pages 82, 85
Thurber, H., Miller, M., McMahan, A., Federspiel, F. (1989) Economic Appraisal of the Alpine Lakes Study Area and Additions, Washington. US Geological Survey Bulletin 1542-E, 348 pages.
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