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Piaba pit, Aurizona mine, Aurizona, Godofredo Viana, Maranhão, Brazili
| Regional Level Types | |
|---|---|
| Piaba pit | Pit (Active) |
| Aurizona mine | Mine (Active) |
| Aurizona | Village |
| Godofredo Viana | Municipality |
| Maranhão | State |
| Brazil | Country |
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Latitude & Longitude (WGS84):
1° 17' 43'' South , 45° 45' 25'' West
Latitude & Longitude (decimal):
Type:
Pit (Active) - last checked 2024
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Cândido Mendes | 8,613 (2012) | 17.4km |
| Carutapera | 12,819 (2012) | 31.3km |
| Viseu | 18,958 (2012) | 43.9km |
| Turiaçu | 10,471 (2012) | 59.2km |
Other/historical names associated with this locality:
Piaba gold mine
An open pit gold mine.
The Piaba gold deposit contains gold mineralization in a vein system that extends at least 4 km along strike with smaller satellite deposits to the west (Tatajuba) and east of the main Piaba deposit.
Greenstone-hosted orogenic gold system.
The mine has produced 594,000 oz (recovered) from 16.0 Mt of laterite, saprolite, and transition ore with an average gold grade of 1.31 g/t and overall gold recovery of 89%. Ore is associated with subvertical tabular
zones of intense shearing and hydrothermal alteration consisting of quartz-carbonate-sericite±chlorite. Quartz±carbonate shear veins are the primary host for gold mineralization with flat to shallow dipping quartz±carbonate extensional veins also carrying gold.
Piaba deposit was formed from a reduced, low-salinity, aqueous-carbonic metamorphic fluid, with ore deposition occurring at 250–330 °C, 1.25 to 2.8 kbar (c. 4 – 9 km depth), and between 1.98 – 2.01 Ga.
The Piaba gold deposit contains gold mineralization in a vein system that extends at least 4 km along strike with smaller satellite deposits to the west (Tatajuba) and east of the main Piaba deposit.
Greenstone-hosted orogenic gold system.
The mine has produced 594,000 oz (recovered) from 16.0 Mt of laterite, saprolite, and transition ore with an average gold grade of 1.31 g/t and overall gold recovery of 89%. Ore is associated with subvertical tabular
zones of intense shearing and hydrothermal alteration consisting of quartz-carbonate-sericite±chlorite. Quartz±carbonate shear veins are the primary host for gold mineralization with flat to shallow dipping quartz±carbonate extensional veins also carrying gold.
Piaba deposit was formed from a reduced, low-salinity, aqueous-carbonic metamorphic fluid, with ore deposition occurring at 250–330 °C, 1.25 to 2.8 kbar (c. 4 – 9 km depth), and between 1.98 – 2.01 Ga.
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
3 valid minerals.
Rock Types Recorded
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ 'Chlorite Group' |
| ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 |
| ⓘ Muscovite var. Sericite Formula: KAl2(AlSi3O10)(OH)2 |
| ⓘ Native Gold Formula: Au |
| ⓘ Quartz Formula: SiO2 |
| ⓘ 'Tourmaline' Formula: AD3G6(T6O18)(BO3)3X3Z |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 9 - Silicates | |||
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| Unclassified | |||
| ⓘ | 'Chlorite Group' | - | |
| ⓘ | 'Tourmaline' | - | AD3G6(T6O18)(BO3)3X3Z |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| B | Boron | |
| B | ⓘ Tourmaline | AD3G6(T6O18)(BO3)3X3Z |
| O | Oxygen | |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Tourmaline | AD3G6(T6O18)(BO3)3X3Z |
| O | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Al | Aluminium | |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Si | Silicon | |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| K | Potassium | |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| K | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Regions, Features and Areas containing this locality
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