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2015 GSA Annual Meeting in Baltimore, Maryland, USA (1-4 November 2015)

Paper No. 46-20
Presentation Time: 9:00 AM-5:30 PM

STRUCTURAL CONTROLS ON GOLD MINERALIZATION AT THE LOULO GOLD DISTRICT (YALEA NORTH AND WARABA AREAS) FOR EXPLORATION TARGETING


DIALLO, Mahamadou1, MAKHLOUF, Mohamed Ben2, LY, Saidou3 and KONE, Salif3, (1)Department of Geology, National School of Engineers ENI-ABT (Mali), 410 Av. Van Vollenhoven, BP: 242, Bamako, 00000, Mali; Department of Geology, University Abdel Maleek Essaadi (Sciences Faculty), B.P.2121 M’hannech II, Tetouan, 00000, Morocco, (2)Department of Geology, University Abdel Maleek Essaadi (Sciences Faculty), B.P.2121 M’hannech II, Tetouan, 00000, Morocco, (3)Department of Geology, National School of Engineers ENI-ABT (Mali), 410 Av. Van Vollenhoven, BP: 242, BAMAKO, 00000, Mali, skonemaat@yahoo.fr

The Loulo gold deposit lies within the eastern part of the Daléma basin of Kédougou-Kéniéba Inlier, western Mali along a belt-basin contact controlled by the Senegal-Mali Shear Zone (SMSZ). It makes up of paleoproterozoic NE-trending elongate belts of metavolcanic and granitic rocks that alternate with metasedimentary belts.

The Gara deposit is hosted in a thin (5 to 20 m) folded and fractured unit of greywacke sandstone, which has been extensively altered in places to a very black quartz tourmaline rock. The Yalea north deposit occurs at the intersection between the N-S and NNE-trending shears and is hosted in a sheared and brecciated sequence of limestones, feldspathic quartzites and polymictic breccias. Structural location of the Yalea and Gara deposits implies that their formation was directly related to sinistral movement on the Senegal-Mali Shear which acted as an important pathway for regional fluid flow with the greatest orogenic gold flux situated in second or higher splays on the eastern wall of the shear.

Structural field mapping at Yalea North has been completed and it was identified three interesting parts. The first is the north south geophysical striking lineament which is associated with a coarse grained greywacke with local tourmaline alteration. The second is the followed northern extension of the Yalea Shear and the latest is a brecciated pink quartzite located between the Yalea Shear and the Yalea Structure.

Waraba target is a large scale, NS to NNW trending shear zone extending located in the far north of the Loulo Permit. The average strike of the mineralized structures at Waraba is N-NE dipping to the east. Domains comprising a high density of interconnected structures are potential mineralized sites. Thus, several favorable sites have been deducted from this structural work in the waraba zone.

Session No. 46--Booth# 398

Structural Geology (Posters)
Sunday, 1 November 2015: 9:00 AM-5:30 PM
Exhibit Hall (Baltimore Convention Center)
Geological Society of America Abstracts with Programs. Vol. 47, No. 7, p.148
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