Kemi Mine, Keminmaa, Lapland, Finlandi
Regional Level Types | |
---|---|
Kemi Mine | Mine (Active) |
Keminmaa | Municipality |
Lapland | Region |
Finland | Country |
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Latitude & Longitude (WGS84):
65° 47' 2'' North , 24° 42' 40'' East
Latitude & Longitude (decimal):
Type:
Mine (Active) - last checked 2021
Köppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Keminmaa | 8,980 (2014) | 7.8km |
Kemi | 22,641 (2014) | 8.6km |
Simo | 3,582 (2014) | 20.2km |
Kuivaniemi | 1,979 (2015) | 31.6km |
Tervola | 3,538 (2014) | 33.5km |
Owned/operated by:
Mindat Locality ID:
9527
Long-form identifier:
mindat:1:2:9527:6
GUID (UUID V4):
e1b4cf71-17cd-4bfe-81e9-8aac0cd21341
Other/historical names associated with this locality:
Elijärvi Mine
Chromium (chromite) mine. The chromite deposit was discovered in 1959/1960.
Mine Information: Open pit production started in 1968, concluding with a 1.5 km-long x 500 m-wide x 220 m-depth pit completed in 2005.
Efforts underground started in 1999 with an 8 m-wide x 5.5 m-high main decline access at 15% grade is on the footwall side of the orebody, about 100 m below the pit rim. It terminates at a depth of 600 m at the base of the hoisting shaft, connecting with several intermediate sublevels. A 14,000 cu m workshop at the 350 m level and a 23,000 cu m main workshop at the 500 m level service the facilities along with pumping stations and a gyratory crusher.
The current mining method is bench cut and fill, a type of sub-level stoping with downhole production drilling. Drifts for the primary stopes are developed laterally from the footwall through the ore zone. Primary stopes are 25 m-high, 15 m-wide and between 30 and 40 m-long. Secondary stopes are identical, but 5 m wider. Cemented fill and fly ash is placed in the primary stopes, while the secondary stopes are backfilled with mine waste rock. The primary stopes are extracted one or two levels above the secondary stopes. Mining sublevels with 5 m x 5 m cross sections are established at 25 m vertical intervals.
Geology: A 2.4 billion year-old mafic-ultramafic layered intrusion, extending 15km northeast of Kemi hosts eleven chromite orebodies within a 4.5 km-long zone varying from 5-105 m in width and an average thickness of 40 m. The chromite-rich horizon appears 50-200 m above the bottom of the intrusion and has an average dip of 70 degrees northwest. Reserves total 57.3Mt [2007], grading 25-26% Cr2O3 between the 500 m level and the bottom of the open pit. The ore body continues at depth, probably to 1,000 m.
The main immediate host rock is weak talc-carbonate in which the hanging wall contact is clearly defined. At the footwall, the chromite and host rock is inter-layered, and must be mined selectively. However, there is strong granite some 80 m below the footwall.
In 2022 a number of large, distinctive pyrite crystals were collected from the dump (article, spirirferminerals.com). The crystals apparently originated from an isolated occurrence at an unknown location in the mine.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
28 valid minerals.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
ⓘ Actinolite Formula: ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 References: |
ⓘ Albite Formula: Na(AlSi3O8) |
ⓘ 'Amphibole Supergroup' Formula: AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
ⓘ Calcite Formula: CaCO3 |
ⓘ Chalcopyrite Formula: CuFeS2 |
ⓘ 'Chlorite Group' |
ⓘ Chromite Formula: Fe2+Cr3+2O4 References: |
ⓘ Chrysotile Formula: Mg3(Si2O5)(OH)4 |
ⓘ Clinochlore Formula: Mg5Al(AlSi3O10)(OH)8 |
ⓘ Clinochlore var. Chromium-bearing Clinochlore Formula: Mg5(Al,Cr)2Si3O10(OH)8 References: |
ⓘ Diopside Formula: CaMgSi2O6 |
ⓘ Enstatite Formula: Mg2Si2O6 References: |
ⓘ Enstatite var. Bronzite Formula: (Mg,Fe2+)2[SiO3]2 References: |
ⓘ Erlichmanite Formula: OsS2 |
ⓘ Hematite Formula: Fe2O3 |
ⓘ Hollingworthite Formula: (Rh,Pt,Pd)AsS |
ⓘ Ilmenite Formula: Fe2+TiO3 |
ⓘ Irarsite Formula: (Ir,Ru,Rh,Pt)AsS |
ⓘ Laurite Formula: RuS2 |
ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
ⓘ Maucherite Formula: Ni11As8 |
ⓘ Millerite Formula: NiS |
ⓘ Moncheite Formula: Pt(Te,Bi)2 |
ⓘ Osmium Formula: (Os,Ir,Ru) |
ⓘ Pentlandite Formula: (NixFey)Σ9S8 |
ⓘ Phlogopite Formula: KMg3(AlSi3O10)(OH)2 |
ⓘ Pyrite Formula: FeS2 |
ⓘ Pyrrhotite Formula: Fe1-xS |
ⓘ Rutile Formula: TiO2 |
ⓘ 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 |
ⓘ Talc Formula: Mg3Si4O10(OH)2 References: |
ⓘ Tremolite Formula: ◻Ca2Mg5(Si8O22)(OH)2 |
ⓘ 'UM1992-13-O:IrPt' Formula: (Ir,Pt)O2 |
ⓘ Uvarovite Formula: Ca3Cr2(SiO4)3 References: |
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
ⓘ | Osmium | 1.AF.05 | (Os,Ir,Ru) |
Group 2 - Sulphides and Sulfosalts | |||
ⓘ | Maucherite | 2.AB.15 | Ni11As8 |
ⓘ | Pentlandite | 2.BB.15 | (NixFey)Σ9S8 |
ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
ⓘ | Millerite | 2.CC.20 | NiS |
ⓘ | Moncheite | 2.EA.20 | Pt(Te,Bi)2 |
ⓘ | Erlichmanite | 2.EB.05a | OsS2 |
ⓘ | Pyrite | 2.EB.05a | FeS2 |
ⓘ | Laurite | 2.EB.05a | RuS2 |
ⓘ | Hollingworthite | 2.EB.25 | (Rh,Pt,Pd)AsS |
ⓘ | Irarsite | 2.EB.25 | (Ir,Ru,Rh,Pt)AsS |
Group 4 - Oxides and Hydroxides | |||
ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
ⓘ | Ilmenite | 4.CB.05 | Fe2+TiO3 |
ⓘ | Hematite | 4.CB.05 | Fe2O3 |
ⓘ | Rutile | 4.DB.05 | TiO2 |
Group 5 - Nitrates and Carbonates | |||
ⓘ | Calcite | 5.AB.05 | CaCO3 |
Group 9 - Silicates | |||
ⓘ | Chrysotile | 9.. | Mg3(Si2O5)(OH)4 |
ⓘ | Uvarovite | 9.AD.25 | Ca3Cr2(SiO4)3 |
ⓘ | Enstatite | 9.DA.05 | Mg2Si2O6 |
ⓘ | var. Bronzite | 9.DA.05 | (Mg,Fe2+)2[SiO3]2 |
ⓘ | Diopside | 9.DA.15 | CaMgSi2O6 |
ⓘ | Tremolite | 9.DE.10 | ◻Ca2Mg5(Si8O22)(OH)2 |
ⓘ | Actinolite | 9.DE.10 | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
ⓘ | Talc | 9.EC.05 | Mg3Si4O10(OH)2 |
ⓘ | Phlogopite | 9.EC.20 | KMg3(AlSi3O10)(OH)2 |
ⓘ | Clinochlore var. Chromium-bearing Clinochlore | 9.EC.55 | Mg5(Al,Cr)2Si3O10(OH)8 |
ⓘ | 9.EC.55 | Mg5Al(AlSi3O10)(OH)8 | |
ⓘ | Albite | 9.FA.35 | Na(AlSi3O8) |
Unclassified | |||
ⓘ | 'Chlorite Group' | - | |
ⓘ | 'Amphibole Supergroup' | - | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
ⓘ | 'UM1992-13-O:IrPt' | - | (Ir,Pt)O2 |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
H | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
H | ⓘ Chrysotile | Mg3(Si2O5)(OH)4 |
H | ⓘ Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
H | ⓘ Clinochlore var. Chromium-bearing Clinochlore | Mg5(Al,Cr)2Si3O10(OH)8 |
H | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
H | ⓘ Talc | Mg3Si4O10(OH)2 |
H | ⓘ Tremolite | ◻Ca2Mg5(Si8O22)(OH)2 |
H | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
C | Carbon | |
C | ⓘ Calcite | CaCO3 |
O | Oxygen | |
O | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
O | ⓘ Albite | Na(AlSi3O8) |
O | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
O | ⓘ Calcite | CaCO3 |
O | ⓘ Chrysotile | Mg3(Si2O5)(OH)4 |
O | ⓘ Chromite | Fe2+Cr23+O4 |
O | ⓘ Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
O | ⓘ Diopside | CaMgSi2O6 |
O | ⓘ Enstatite | Mg2Si2O6 |
O | ⓘ Hematite | Fe2O3 |
O | ⓘ Ilmenite | Fe2+TiO3 |
O | ⓘ Clinochlore var. Chromium-bearing Clinochlore | Mg5(Al,Cr)2Si3O10(OH)8 |
O | ⓘ Magnetite | Fe2+Fe23+O4 |
O | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
O | ⓘ Rutile | TiO2 |
O | ⓘ Talc | Mg3Si4O10(OH)2 |
O | ⓘ Tremolite | ◻Ca2Mg5(Si8O22)(OH)2 |
O | ⓘ Uvarovite | Ca3Cr2(SiO4)3 |
O | ⓘ Enstatite var. Bronzite | (Mg,Fe2+)2[SiO3]2 |
O | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
O | ⓘ UM1992-13-O:IrPt | (Ir,Pt)O2 |
F | Fluorine | |
F | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
Na | Sodium | |
Na | ⓘ Albite | Na(AlSi3O8) |
Mg | Magnesium | |
Mg | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
Mg | ⓘ Chrysotile | Mg3(Si2O5)(OH)4 |
Mg | ⓘ Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
Mg | ⓘ Diopside | CaMgSi2O6 |
Mg | ⓘ Enstatite | Mg2Si2O6 |
Mg | ⓘ Clinochlore var. Chromium-bearing Clinochlore | Mg5(Al,Cr)2Si3O10(OH)8 |
Mg | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
Mg | ⓘ Talc | Mg3Si4O10(OH)2 |
Mg | ⓘ Tremolite | ◻Ca2Mg5(Si8O22)(OH)2 |
Mg | ⓘ Enstatite var. Bronzite | (Mg,Fe2+)2[SiO3]2 |
Al | Aluminium | |
Al | ⓘ Albite | Na(AlSi3O8) |
Al | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
Al | ⓘ Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
Al | ⓘ Clinochlore var. Chromium-bearing Clinochlore | Mg5(Al,Cr)2Si3O10(OH)8 |
Al | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
Si | Silicon | |
Si | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
Si | ⓘ Albite | Na(AlSi3O8) |
Si | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
Si | ⓘ Chrysotile | Mg3(Si2O5)(OH)4 |
Si | ⓘ Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
Si | ⓘ Diopside | CaMgSi2O6 |
Si | ⓘ Enstatite | Mg2Si2O6 |
Si | ⓘ Clinochlore var. Chromium-bearing Clinochlore | Mg5(Al,Cr)2Si3O10(OH)8 |
Si | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
Si | ⓘ Talc | Mg3Si4O10(OH)2 |
Si | ⓘ Tremolite | ◻Ca2Mg5(Si8O22)(OH)2 |
Si | ⓘ Uvarovite | Ca3Cr2(SiO4)3 |
Si | ⓘ Enstatite var. Bronzite | (Mg,Fe2+)2[SiO3]2 |
Si | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
S | Sulfur | |
S | ⓘ Chalcopyrite | CuFeS2 |
S | ⓘ Erlichmanite | OsS2 |
S | ⓘ Hollingworthite | (Rh,Pt,Pd)AsS |
S | ⓘ Irarsite | (Ir,Ru,Rh,Pt)AsS |
S | ⓘ Laurite | RuS2 |
S | ⓘ Millerite | NiS |
S | ⓘ Pentlandite | (NixFey)Σ9S8 |
S | ⓘ Pyrite | FeS2 |
S | ⓘ Pyrrhotite | Fe1-xS |
Cl | Chlorine | |
Cl | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
K | Potassium | |
K | ⓘ Phlogopite | KMg3(AlSi3O10)(OH)2 |
Ca | Calcium | |
Ca | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
Ca | ⓘ Calcite | CaCO3 |
Ca | ⓘ Diopside | CaMgSi2O6 |
Ca | ⓘ Tremolite | ◻Ca2Mg5(Si8O22)(OH)2 |
Ca | ⓘ Uvarovite | Ca3Cr2(SiO4)3 |
Ti | Titanium | |
Ti | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
Ti | ⓘ Ilmenite | Fe2+TiO3 |
Ti | ⓘ Rutile | TiO2 |
Cr | Chromium | |
Cr | ⓘ Chromite | Fe2+Cr23+O4 |
Cr | ⓘ Clinochlore var. Chromium-bearing Clinochlore | Mg5(Al,Cr)2Si3O10(OH)8 |
Cr | ⓘ Uvarovite | Ca3Cr2(SiO4)3 |
Fe | Iron | |
Fe | ⓘ Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
Fe | ⓘ Chalcopyrite | CuFeS2 |
Fe | ⓘ Chromite | Fe2+Cr23+O4 |
Fe | ⓘ Hematite | Fe2O3 |
Fe | ⓘ Ilmenite | Fe2+TiO3 |
Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
Fe | ⓘ Pentlandite | (NixFey)Σ9S8 |
Fe | ⓘ Pyrite | FeS2 |
Fe | ⓘ Pyrrhotite | Fe1-xS |
Fe | ⓘ Enstatite var. Bronzite | (Mg,Fe2+)2[SiO3]2 |
Ni | Nickel | |
Ni | ⓘ Maucherite | Ni11As8 |
Ni | ⓘ Millerite | NiS |
Ni | ⓘ Pentlandite | (NixFey)Σ9S8 |
Cu | Copper | |
Cu | ⓘ Chalcopyrite | CuFeS2 |
As | Arsenic | |
As | ⓘ Hollingworthite | (Rh,Pt,Pd)AsS |
As | ⓘ Irarsite | (Ir,Ru,Rh,Pt)AsS |
As | ⓘ Maucherite | Ni11As8 |
Ru | Ruthenium | |
Ru | ⓘ Irarsite | (Ir,Ru,Rh,Pt)AsS |
Ru | ⓘ Laurite | RuS2 |
Ru | ⓘ Osmium | (Os,Ir,Ru) |
Rh | Rhodium | |
Rh | ⓘ Hollingworthite | (Rh,Pt,Pd)AsS |
Rh | ⓘ Irarsite | (Ir,Ru,Rh,Pt)AsS |
Pd | Palladium | |
Pd | ⓘ Hollingworthite | (Rh,Pt,Pd)AsS |
Te | Tellurium | |
Te | ⓘ Moncheite | Pt(Te,Bi)2 |
Os | Osmium | |
Os | ⓘ Erlichmanite | OsS2 |
Os | ⓘ Osmium | (Os,Ir,Ru) |
Ir | Iridium | |
Ir | ⓘ Irarsite | (Ir,Ru,Rh,Pt)AsS |
Ir | ⓘ Osmium | (Os,Ir,Ru) |
Ir | ⓘ UM1992-13-O:IrPt | (Ir,Pt)O2 |
Pt | Platinum | |
Pt | ⓘ Hollingworthite | (Rh,Pt,Pd)AsS |
Pt | ⓘ Irarsite | (Ir,Ru,Rh,Pt)AsS |
Pt | ⓘ Moncheite | Pt(Te,Bi)2 |
Pt | ⓘ UM1992-13-O:IrPt | (Ir,Pt)O2 |
Bi | Bismuth | |
Bi | ⓘ Moncheite | Pt(Te,Bi)2 |
Other Regions, Features and Areas containing this locality
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Kemi Mine, Keminmaa, Lapland, Finland