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Juma district, Apuí, Amazonas, Brazili
Regional Level Types
Juma districtMining District
ApuíMunicipality
AmazonasState
BrazilCountry

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Latitude & Longitude (WGS84):
6° 45' South , 59° 40' West
Latitude & Longitude (decimal):
-6.75000,-59.66667
GRN:
S05W42
Type:
Mining District
Köppen climate type:
Am : Tropical monsoon climate
Mindat Locality ID:
427502
Long-form identifier:
mindat:1:2:427502:5
GUID (UUID V4):
0


The Juma District is located in the SW Amazon Craton, covering an area of 18,000 km² that records Paleoproterozoic to Paleozoic geologic events. 24 gold occurrences in the Juma District, the majority corresponding to artisanal prospects, including 16 primary deposits. There are two types of gold occurrences for the Apuí region. The first type is associated with the Orosirian Chuim and Arraia granites, possibly related to a magmatic-arc environment with a dominantly compressive ductile tectonic regime. The second type is characterized by a strong structural control associated with at least two mineralized events from Paleo- to Mesoproterozoic.
In the first type, gold occurs in quartz veins or hydrothermal breccias with siliceous matrices, occasionally exhibiting drusiform, microcrystalline, and lattice-bladed textures. Features of low-sulfidation epithermal systems, such as breccias containing placoid calcite pseudomorphs replaced by quartz. Sulfide is uncommon but can be locally associated with mineralization. Hydrothermal alteration halos are evidenced by chloritization, carbonation, sericitization, quartz-adularia veins, and clay minerals. The Chuim and Arraia granites have similarities in age and chemistry with the granites from the Matupá Suite, particularly the Serrinha gold deposit in the Alta Floresta Mineral Province. Certain geologic characteristics are also similar to the Tocantinzinho Deposit in Tapajós Domain, and to porphyry gold deposits. The apparent absence of regional metamorphism in the host rocks and the correspondence with the literature are consistent with a magmatic–hydrothermal origin for the gold, with similarities to porphyry–epithermal systems.

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Standard Detailed Gallery Strunz Chemical Elements

Commodity List

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


Mineral List


8 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 Diagram

Detailed Mineral List:

ⓘ Actinolite
Formula: ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
ⓘ Calcite
Formula: CaCO3
ⓘ 'Chlorite Group'
ⓘ Epidote
Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
ⓘ 'Feldspar Group'
ⓘ 'Florencite'
ⓘ Kaolinite
Formula: Al2(Si2O5)(OH)4
ⓘ 'K Feldspar'
ⓘ 'K Feldspar var. Adularia'
Formula: KAlSi3O8
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ Muscovite var. Sericite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ Native Gold
Formula: Au
ⓘ Pyrite
Formula: FeS2
ⓘ Quartz
Formula: SiO2
ⓘ 'Tourmaline'
Formula: AD3G6(T6O18)(BO3)3X3Z

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘNative Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
ⓘPyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
ⓘQuartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
Group 9 - Silicates
ⓘEpidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
ⓘActinolite9.DE.10◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
ⓘMuscovite9.EC.15KAl2(AlSi3O10)(OH)2
ⓘvar. Sericite9.EC.15KAl2(AlSi3O10)(OH)2
ⓘKaolinite9.ED.05Al2(Si2O5)(OH)4
Unclassified
ⓘ'K Feldspar
var. Adularia'		-KAlSi3O8
ⓘ'Chlorite Group'-
ⓘ'Feldspar Group'-
ⓘ'Tourmaline'-AD3G6(T6O18)(BO3)3X3Z
ⓘ'K Feldspar'-
ⓘ'Florencite'-

List of minerals for each chemical element

HHydrogen
Hⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Hⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Hⓘ KaoliniteAl2(Si2O5)(OH)4
Hⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Hⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
BBoron
Bⓘ TourmalineAD3G6(T6O18)(BO3)3X3Z
CCarbon
Cⓘ CalciteCaCO3
OOxygen
Oⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Oⓘ K Feldspar var. AdulariaKAlSi3O8
Oⓘ CalciteCaCO3
Oⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Oⓘ KaoliniteAl2(Si2O5)(OH)4
Oⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Oⓘ QuartzSiO2
Oⓘ TourmalineAD3G6(T6O18)(BO3)3X3Z
Oⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
MgMagnesium
Mgⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
AlAluminium
Alⓘ K Feldspar var. AdulariaKAlSi3O8
Alⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Alⓘ KaoliniteAl2(Si2O5)(OH)4
Alⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Alⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
SiSilicon
Siⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Siⓘ K Feldspar var. AdulariaKAlSi3O8
Siⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Siⓘ KaoliniteAl2(Si2O5)(OH)4
Siⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Siⓘ QuartzSiO2
Siⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
SSulfur
Sⓘ PyriteFeS2
KPotassium
Kⓘ K Feldspar var. AdulariaKAlSi3O8
Kⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Kⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
CaCalcium
Caⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Caⓘ CalciteCaCO3
Caⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
FeIron
Feⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Feⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Feⓘ PyriteFeS2
AuGold
Auⓘ Native GoldAu

Other Regions, Features and Areas containing this locality

South America Plate

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References

[1]Queiroz, Lila Costa, Adalene Moreira Silva, Frederico Ricardo Ferreira Rodrigues de Oliveira e Sousa, Michele Zorzetti Pitarello, and Márcia Abrahão Moura. (2023) "Strategies for Targeting in Undercover Terrains: Modeling Multi-Source Data in Apuí Region, SW Amazon Craton, Brazil" Minerals 13, no. 1: 78. https://doi.org/10.3390/min13010078
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