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Birimian Greenstone Belt of West Africa

Indigo Exploration Inc. holds four gold exploration permits in Burkina Faso, West Africa. These projects lie within the Birimian Greenstone Belt of West Africa, one of the most prolific gold producing regions of the world.

The Birimian Greenstone Belt consists of Lower Proterozoic age volcanic and sedimentary units intruded and surrounded by related plutonic rocks and has a long history of gold mining with industrial history beginning in Ghana at the end of the 19th century. The modern Birimian Mining Era began in the 1980’s with the discovery of very fine gold, which had been previously unknown, in the Loulo and Syama gold deposits in Mali. These discoveries underlined the gold potential of the Birimian Greenstone Belt of West Africa, which had remained underestimated outside Ghana.

On going exploration and development since the 1980’s has lead to the discovery of several world class deposits as shown in the following table. Grades in these deposits vary greatly from 7.59 grams per tonne (gpt) Au at Obuasi to 1.21 gpt Au at Siguiri.

Gold Reserves and/or Production from Key Mines in the Birimian Greenstone Belt

Deposit
Country
Ounces
Grade
Obuasi
Ghana
38,803,425
7.59
Afaho
Ghana
27,127,024
2.26
Akyem
Ghana
20,300,000
1.68
Tarkwa
Ghana
17,935,000
1.40
Loulo
Mail
16,020,000
4.49
Sadiola
Mali
14,022,000
2.03
Siguiri
Guinea
7,500,000
1.21
Morila
Mali
8,500,000
6.28
Syama
Mali
7,900,000
3.20
Fekola
Burkina Faso
5,150,000
2.16
Gounkoto Burkina Faso 5,400,000 4.4

Most Birimian hosted gold deposits occur in corridors 10 to 15 kilometres wide, in the transition zone between volcanic belts and sedimentary basins which are characterized by regionally extensive shear zones. Two major styles of gold mineralization occur in the Birimian: structurally controlled quartz vein style deposits and chemical sediment hosted deposits where gold is associated in selvages to quartz veins.

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Greenstone Belts of Burkina Faso

Indigo has chosen to concentrate in Burkina Faso, a politically stable country within French West Africa. Gold exploration in Burkina Faso has recently taken off, spurred by the revision of the country’s mining code in 2003. Exploration in Burkina Faso is in its infancy, compared to the more mature exploration climates in the adjoining countries of Ghana and Mali, where most of the major Birimian Gold Mines currently lie. However, in the short time since 2003, nine mines have opened in Burkina Faso and total gold reserves and resources have tripled to 50 million ounces. Burkina Faso is the fourth largest gold producer in Africa after South Africa, Ghana and Mali.

Burkina Faso remains under explored in comparison to Ghana and Mali. Indigo management believes there are strong probabilities for major gold discoveries in Burkina Faso.

 

Indigo has acquired a land package of 4 properties spread throughout the various greenstone belts of Burkina Faso:

Permit Sq. Km. Greenstone Belt Mineralization
Kodyel 191 Fada N'Gourma Stacked veins
Lati 184 Boromo Shear hosted veins
Loto 70 Perkoa - Poura Sheeted veins
Moule 185 Perkoa - Poura Sheeted veins

Note: The Company retains priority on the Kodyel and Lati permits through its request for a 3 year exceptional extension to the Minister of Mines, whose decision remains pending.

Projects in Burkina Faso