World Distribution of Uranium and Thorium Deposits (UDEPO)

Algeria: Tahaggart

General Information

Deposit Id

Algeria

Country

Tamanrasset Province

Political Province

Tahaggart

Deposit Name

Tassila

Synonym Names

Deposit

Site Type

Year of Discovery

7/6/2026

Modified On

LIUYANT

Modified By

Not Applicable

Deposit associated with Nuclear Fuel Cycle Facilities Database

Yes

Deposit is mentioned in Red Book

General Remark

Resource Information

Dormant

Deposit Status

Proterozoic unconformity

Deposit Type

Unconformity-contact

Deposit Sub Type

Deposit Class

Yes

Conventional Deposit Type?

Subhorizontal, undulating with the paleotopography.

Deposit Shape

Deposit Length

Deposit Width

Depth To Deposit Top

Depth To Deposit Bottom

Deposit Thickness

Deposit Dimensions

≥0.20 - <0.50

Grade Range

≥1000 - <2500

Original (Geological) Resource Range

General Description Of Resources

Type of estimate

1977

Date of estimate

Red Book Resource Cost Category

Cumulative Production (t)

Production Grade (%)

Production Period

Commodities Recovered

Geological Information

Host Rock Stratigraphic Age

Mineralisation Radiometric Age

Precambrian/Proterozoic-Phanerozoic/Cenozoic/Paleogene/Eocene

Mineralisation Stratigraphic Age

Host Rock Radiometric Age

Major Ore Mineral(s)

Other Ore Minerals

Elemental Association

Description of Mineralization

Alteration

The mineralisation is strongly associated to the pedogenetic alteration process developed below the paleosurface before deposition of the Cambro-Ordovician formations. 
Adsorption on neoformed clay minerals has probably played a greater rôle for uranium deposition than oxydo-reduction processes.

Metallogenic Aspects

Ore Controls

Mineralisation (autunite, torbernite, carnotite) is located in the altered gneisses, within cavities, microfractures and schistosity plans. An important part of the mineralisation is associated to kaolinite and quartz. In the quartz, mineralisation is located in the secondary overgrowths. The Cambro-Ordovician detrital formations do not have any mineralisation.

General Description of Mineralization

Precambrian Basement

Geological Region

Mining District

Geological Setting

Geological Remarks

Tectonic Setting

Lithology

Along the southern border of the Hoggar Precambrian shield, Lower Paleozoic (Cambro-Ordovician ?) detrital sediments lie unconformably on weathered metamorphic rocks. The paleosurface is a peneplain with only minor topographical reliefs from one to a few metres high. The nature and intensity of the weathering process was controled by the topography. The existence of badly drained areas was particularly important.
The deposit is present in the weathered gneiss underneath the paleosurface. Mineralogical and geochemical observations indicate that the ore deposit was formed during the period of weathering.

General Geological Remarks