The largest bauxite mine in Brazil.

The Porto Trombetas bauxite deposits are developed over sedimentary formations of the Amazon Basin and display well-organized lateritic profiles comprising, from top to base, an upper kaolinitic layer, nodular bauxite, ferruginous and bauxitic horizons, a lower kaolinitic layer, and basal sediments.

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.

ⓘ Bauxite (Aluminium)

Mineral List

ⓘ Gibbsite

ⓘ Kaolinite

2 valid minerals.

Rock Types Recorded

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ Gibbsite

Formula: Al(OH)₃

References:

de Oliveira, Saulo B. (2026) Relationship between bauxitization and regolith-hosted REE deposits: insights from Brazilian bauxites and Morro do Ferro deposit, Poços de Caldas alkaline complex. Ore Geology Reviews, 194. p.107371. doi:10.1016/j.oregeorev.2026.107371

ⓘ Kaolinite

Formula: Al₂(Si₂O₅)(OH)₄

References:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	Gibbsite	4.FE.10	Al(OH)₃
Group 9 - Silicates
ⓘ	Kaolinite	9.ED.05	Al₂(Si₂O₅)(OH)₄

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Gibbsite	Al(OH)₃
H	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄
O	Oxygen
O	ⓘ Gibbsite	Al(OH)₃
O	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄
Al	Aluminium
Al	ⓘ Gibbsite	Al(OH)₃
Al	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄
Si	Silicon
Si	ⓘ Kaolinite	Al₂(Si₂O₅)(OH)₄

Other Regions, Features and Areas containing this locality

South AmericaContinent

South America PlateTectonic Plate

Amazonas basinBasin
Amazonian GrabenNarrow Rift

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]de Oliveira, Saulo B. (2026) Relationship between bauxitization and regolith-hosted REE deposits: insights from Brazilian bauxites and Morro do Ferro deposit, Poços de Caldas alkaline complex. Ore Geology Reviews, 194. p.107371. doi:10.1016/j.oregeorev.2026.107371

Quick NavTop Commodities Mineral List Rock Types Other Regions References

Mindat.org® is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: October 19, 2026 23:56:09 Page updated: June 11, 2026 14:35:30

Go to top of page

Porto Trombetas mine, Oriximiná, Pará, BraziliRegional Level TypesPorto Trombetas mineMine OriximináMunicipality ParáState BrazilCountry function showexplain() { $("#locexplain").toggle(); if (typeof movemap === "function") movemap(); }