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Romaria mine, Romaria, Bagagem River valley, Coromandel, Minas Gerais, Brazili
Regional Level Types
Romaria mineMine
Romaria- not defined -
Bagagem River valleyValley
Coromandel- not defined -
Minas GeraisState
BrazilCountry

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Latitude & Longitude (WGS84):
18° 52' 40'' South , 47° 35' 3'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Monte Carmelo44,041 (2012)19.3km
Coromandel22,647 (2012)60.5km
Other/historical names associated with this locality:
Romaria (former Água Suja)


This diamond mine was opened around 1867 following the discovery of diamonds in the nearby Água Suja stream, a tributary of the Bagagem river. The mine closed in 1984. While most diamonds in the Coromandel district were obtained from alluvial deposits, at Romaria diamonds were mined from a lithified conglomerate in the river bottomland. This conglomerate has been interpreted as a debris flow deposit consisting of materials reworked from surrounding metasedimentary bedrock including the Neoproterozoic Araxá Group and Cretaceous sedimentary rocks (Suguio et al., 1979; Andrade and Chaves, 2009). As the debris flow apparently followed modern topographic contours, it is most likely of Quaternary age. Fleischer (1998), however, presented evidence that normal block faulting led to erosion of the original diamondiferous conglomerate on the upthrown (west) side of the faults, with deposition occurring in alluvial fans on the down-dropped side. He correlated localized outcrops of this material for a little over 40 km in an NW-SE direction and suggested the existence of a faulted lineament along nearly the entire length of the Bagagem River valley. The diamonds were probably reworked from the Mata da Corda Group of Late Cretaceous age, a resistant unit that caps the mesas on either side of the Bagagem River valley.

Lithic clasts in the conglomerate are up to 0.8 meters in size and include schist, phyllite, quartzite, basalt, reworked conglomerate, vein quartz, and siliceous concretions rich in opal. The matrix is arenaceous and contains considerable kaolinite and illite. Framework grains include mm-scale grains of heavy minerals including pyrope, staurolite, "hornblende," epidote, kyanite, monazite, tourmaline, zircon, and anatase. The opaques include magnetite, hematite, goethite, and ilmenite. The pyrope is chromium-rich, with chromium/calcium oxide ratios plotting mostly in the G4, G5, and G9 fields, indicating the poor likelihood of associated diamonds (Grütter et al., 2004). Nevertheless, diamonds from the area are large and clear, although commonly abraded and fractured, and suggest a proximal source, however, that has yet to be identified.

Modified by NK, January 2017.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


18 valid minerals.

Detailed Mineral List:

Almandine
Formula: Fe2+3Al2(SiO4)3
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Anatase
Formula: TiO2
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Diamond
Formula: C
Reference: Fleischer, R. (1998): Mineralium Deposita 33, 238-254.
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Goethite
Formula: α-Fe3+O(OH)
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Grossular
Formula: Ca3Al2(SiO4)3
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Hematite
Formula: Fe2O3
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Ilmenite
Formula: Fe2+TiO3
Kaolinite
Formula: Al2(Si2O5)(OH)4
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Kyanite
Formula: Al2(SiO4)O
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Magnetite
Formula: Fe2+Fe3+2O4
'Monazite'
Formula: REE(PO4)
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Muscovite var. Illite
Formula: K0.65Al2.0[Al0.65Si3.35O10](OH)2
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Opal
Formula: SiO2 · nH2O
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Perovskite
Formula: CaTiO3
Pyrope
Formula: Mg3Al2(SiO4)3
Quartz
Formula: SiO2
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Rutile
Formula: TiO2
'Tourmaline'
Formula: AD3G6 (T6O18)(BO3)3X3Z
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Zircon
Formula: Zr(SiO4)
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Diamond1.CB.10aC
Group 4 - Oxides and Hydroxides
Anatase4.DD.05TiO2
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
Ilmenite4.CB.05Fe2+TiO3
Magnetite4.BB.05Fe2+Fe3+2O4
Opal4.DA.10SiO2 · nH2O
Perovskite4.CC.30CaTiO3
Quartz4.DA.05SiO2
Rutile4.DB.05TiO2
Group 9 - Silicates
Almandine9.AD.25Fe2+3Al2(SiO4)3
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Grossular9.AD.25Ca3Al2(SiO4)3
Kaolinite9.ED.05Al2(Si2O5)(OH)4
Kyanite9.AF.15Al2(SiO4)O
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var. Illite9.EC.15K0.65Al2.0[Al0.65Si3.35O10](OH)2
Pyrope9.AD.25Mg3Al2(SiO4)3
Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Monazite'-REE(PO4)
'Tourmaline'-AD3G6 (T6O18)(BO3)3X3Z

List of minerals for each chemical element

HHydrogen
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H Goethiteα-Fe3+O(OH)
H Muscovite var. IlliteK0.65Al2.0[Al0.65Si3.35O10](OH)2
H KaoliniteAl2(Si2O5)(OH)4
H OpalSiO2 · nH2O
H MuscoviteKAl2(AlSi3O10)(OH)2
BBoron
B TourmalineAD3G6 (T6O18)(BO3)3X3Z
CCarbon
C DiamondC
OOxygen
O MagnetiteFe2+Fe23+O4
O IlmeniteFe2+TiO3
O PerovskiteCaTiO3
O PyropeMg3Al2(SiO4)3
O RutileTiO2
O AlmandineFe32+Al2(SiO4)3
O AnataseTiO2
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O Goethiteα-Fe3+O(OH)
O GrossularCa3Al2(SiO4)3
O HematiteFe2O3
O Muscovite var. IlliteK0.65Al2.0[Al0.65Si3.35O10](OH)2
O KaoliniteAl2(Si2O5)(OH)4
O KyaniteAl2(SiO4)O
O MonaziteREE(PO4)
O OpalSiO2 · nH2O
O QuartzSiO2
O TourmalineAD3G6 (T6O18)(BO3)3X3Z
O ZirconZr(SiO4)
O MuscoviteKAl2(AlSi3O10)(OH)2
MgMagnesium
Mg PyropeMg3Al2(SiO4)3
AlAluminium
Al PyropeMg3Al2(SiO4)3
Al AlmandineFe32+Al2(SiO4)3
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al GrossularCa3Al2(SiO4)3
Al Muscovite var. IlliteK0.65Al2.0[Al0.65Si3.35O10](OH)2
Al KaoliniteAl2(Si2O5)(OH)4
Al KyaniteAl2(SiO4)O
Al MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Si PyropeMg3Al2(SiO4)3
Si AlmandineFe32+Al2(SiO4)3
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si GrossularCa3Al2(SiO4)3
Si Muscovite var. IlliteK0.65Al2.0[Al0.65Si3.35O10](OH)2
Si KaoliniteAl2(Si2O5)(OH)4
Si KyaniteAl2(SiO4)O
Si OpalSiO2 · nH2O
Si QuartzSiO2
Si ZirconZr(SiO4)
Si MuscoviteKAl2(AlSi3O10)(OH)2
PPhosphorus
P MonaziteREE(PO4)
KPotassium
K Muscovite var. IlliteK0.65Al2.0[Al0.65Si3.35O10](OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca PerovskiteCaTiO3
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca GrossularCa3Al2(SiO4)3
TiTitanium
Ti IlmeniteFe2+TiO3
Ti PerovskiteCaTiO3
Ti RutileTiO2
Ti AnataseTiO2
FeIron
Fe MagnetiteFe2+Fe23+O4
Fe IlmeniteFe2+TiO3
Fe AlmandineFe32+Al2(SiO4)3
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe Goethiteα-Fe3+O(OH)
Fe HematiteFe2O3
ZrZirconium
Zr ZirconZr(SiO4)

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Draper, D. (1911) The diamond bearing deposits of Bagagem and Agua Suja, in the state of Minas Geraes (sic), Brazil. Transactions of the Geological Society of South Africa, 14, 8-19.
Suguio, K., Svisero, D.P., and Filitti, F.W. (1979) Conglomerados polimiticos diamantiferos de idade cretácica de Romaria (MG): um exemplo de sedimentação de leques aluviais. 2nd Simpósio Regional de Geologia Rio Claro, 1, 217-229.
Fleischer, R. (1998) A rift model for the sedimentary diamond deposits of Brazil. Mineralium Deposita, 33, 238-254.
Grütter, H.S., Gurney, J. J., Menziesc, A.H., and Winter, F. (2004) An updated classification scheme for mantle-derived garnet, for use by diamond explorers. Lithos, 77, 841-857.
Andrade, K.W. and Chaves, M.L.S.C. (2009) Geologia e a redistribuição sedimentar pós-Cretácica dos depósitos diamantíferos da região ao sul de Coromandel (MG). Geonomos, 17(1), 27-36.
Coelho, F.M. (2010) Aspectos geológicos e mineralógicos da mina de diamantes de Romaria, Minas Geras. tese, Universidade de São Paulo, Instituto de Geociêncas.
Andrade, K.W. and Chaves, M.L.S.C. (2011) Geologia e mineralogia do kimberlito Grota do Cedro (Coromandel, MG). Geonomos, 19(1), 39-45.

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