Burkina Faso

 

PDI’s tenement holding covers 949 km2 including approximately 90 km of strike length in the Samira Hill greenstone belt in eastern Burkina Faso (see map).  This belt hosts the 2.5 million ounce Samira Hill gold deposit across the border in Niger and contains numerous active artisanal gold mine sites along its length.  PDI currently owns 100%, or has the rights to earn 95% to 100% of all its permits in Burkina Faso.  

 

The Company has discovered gold mineralisation on multiple prospects in Eastern Burkina Faso during the past four years including the Bongou gold deposit.  A formal Mineral Resource Estimate on Bongou resulted in 184,000oz of gold in the Inferred and Indicated Mineral Resource categories with an average grade of 2.6g/t Au, including 136,000oz at 3.8g/t Au (ASX release dated 4th September, 2014). Recent drilling on the Bira prospect has identified an 800m long zone of gold mineralisation which is open in all directions, along with very extensive soil geochemical anomalies directly along strike from there.

 

Predictive entered into a joint venture with Progress Minerals International (Progress) commencing on 30th September 2017.  The agreement allows Progress to earn a 70% interest in all permits within the area of influence (AOI – see map below) by spending $US5 million on exploration and project evaluation. The Joint Venture’s objective is to advance PDI’s eastern Burkina Faso prospects as quickly as possible towards a scoping study on a multi-pit mining operation feeding a central mill.

 

Locality Plan - PDI permits in Eastern Burkina Faso. Red coloured permits were granted in 2017. Yellow dots denote drilled prospects with multiple ore grade and width gold intercepts. The white outlines denotes the Area of Influence in which the Progress Minerals Burkina Faso Joint Venture operates.

 

Bira Permit

 

The area was explored by Anglo American through its subsidiary Anmercosa in the late 1990’s.  PDI holds a database of Anmercosa information including soil geochemistry and RC drill data.

 

Bira Drilling

 

5,129m of RC drilling program been completed by Progress Minerals on this prospect. A NNE striking 800m long zone of gold mineralisation in foliated volcano-sedimentary rocks has been identified, showing good widths and ore continuity (see map and sample cross section below). Preliminary bottle roll cyanidation tests suggest very high gold recoveries are likely to be obtained in a full program of metallurgical test work. Drill and indicative metallurgy (bottle roll) results were reported to ASX on 20/3/18, 26/4/18, and 15/5/18.

Better intersections include the following:

  • BIRRC001: 17m at 1.74 g/t Au from 2m.
  • BIRRC002 27m at 1.83g/t Au from 23m.
  • BIRRC004: 8m at 2.00g/t Au from 101m.
  • BIRRC005: 16m at 1.15g/t Au from 20m.
  • BIRRC008: 11m at 1.69g/t Au from 54m.
  • BIRRC009: 8m at 1.69g/t Au from 87m.
  • BIRRC010: 22m at 1.55g/t Au from 115m.
  • BIRRC012: 13m at 1.35g/t Au from 49m.
  • BIRRC015: 16m at 1.13 g/t Au from 42m.
  • BIRRC016: 21m at 1.39g/t Au from 72m.
  • BIRRC017: 14m at 1.42g/t Au from 98m.
  • BIRRC019: 33m at 1.42g/t Au from 51m.
  • BIRRC020: 8m at 1.92g/t Au from 80m.
  • BIRRC021: 14m at 1.81g/t Au from 45m.
  • BIRRC023: 29m at 0.99g/t Au from 79m.

Plan view of RC drill results from the Bira permit. Note the series of inferred NE trending faults interpreted from aeromagnetic data, two of which may offset the gold mineralisation.

 

Cross-section through Bira gold mineralisation demonstrating strong hole-to-hole continuity.

 

Bira Power Auger

 

Power auger drilling to the south and south-west of the known gold mineralisation at Bira has shown that anomalous gold values extend for over 20km (see map). Six prospects have been selected for RC drilling in late 2018 and early 2019.

 

Power auger results and 2018-19 RC drill target locations SW of Bira, Burkina Faso (results reported to ASX on 20/3/18, 26/4/18, 15/5/18 and 19/6/18).

Bongou Gold Deposit

Bongou was discovered by Predictive in 2012 and drilled in 2013-14 with the following characteristics:

  • Good gold grades.
  • 30-40m thick (see cross section and longitudinal projection below).
  • Disseminated mineralisation style with very good hole to hole continuity.
  • Excellent metallurgical performance in testwork – cyanidation of a standard 75 micron grind of primary (sulphide-bearing) mineralisation resulted in a 94% gold recovery with 90% of the gold being leached out in the first 4 hours of the test (see gold leach graph below).
  • Hosted by a strongly altered, shear-bound granodiorite body 150m long and plunging (and open) to depth.

A JORC-compliant resource estimate by Golder and Associates (ASX release dated 4/9/14) resulted in the following:

 

Indicated Resources

Inferred Resources

Total Resources

Cut-off grade

Milliontonnes

Au (g/t)

Ounces

Million tonnes

Au (g/t)

Ounces

Million tonnes

Au (g/t)

Ounces

0.4

1.21

2.54

99,000

1.33

2.13

91,000

2.55

2.32

190,000

0.8

1.14

2.67

98,000

1.09

2.48

86,000

2.22

2.58

184,000

2.0

0.64

3.64

75,000

0.49

3.90

61,000

1.13

3.75

136,000

3.0

0.34

4.68

52,000

0.28

4.95

45,000

0.62

4.80

96,000

Longitudinal projection through the Bongou gold deposit. Gold drill intercepts are shown with true widths (results reported to the ASX on 2/12/13, 16/12/13, 20/3/14 and 1/4/14)

 

Cross section through the Bongou gold deposit (showing down-hole gold intercepts).

 

Silicified, quartz-veined, gold-mineralised microgranite in contact with foliated gabbro/mafic volcanics in Bongou open pit. Mr Seye Kote, Predictive Discovery SARL’s Chief Geologist-Burkina Faso, in the foreground.

 


Metallurgical testwork result – cyanide leach curve using a standard 75 micron ground sample of primary (sulphide-bearing) mineralisation. 90% of the gold was extracted in the first four hours of leaching (these results were reported to the ASX on 14/5/13. This information was prepared and first disclosed under the JORC Code 2004. It has not been updated since to comply with the JORC Code 2012 on the basis that the information has not materially changed since it was last reported).

 

Exploration Target – prospects near Bongou

 

An Exploration Target was calculated on drilled prospects within 10km of the Bongou gold deposit (ASX release dated 3/9/15). The Exploration Target detailed in the following table is estimated to be in a range of 9.4 to 10.4 million tonnes averaging between approximately 1.5 to 1.7 g/t Au and containing approximately 460,000 to 563,000 ounces of gold, as follows:

 

Prospect Names

Million Tonnes

Grade

Ounces Gold

(see map below for locations) 

Lower estimate

Higher estimate

Lower estimate

Higher estimate

Lower estimate

Higher estimate

Dave

6.71

7.41

1.49

1.65

322,000

394,000

Laterite Hill

1.48

1.63

1.62

1.79

77,000

94,000

Near Bongou (W2/W8)

0.27

0.30

1.57

1.74

14,000

17,000

Prospect 71

0.68

0.75

1.21

1.33

26,000

32,000

Target 92

0.23

0.26

2.88

3.18

21,000

26,000

Totals

9.37

10.35

1.53

1.69

460,000

563,000

Note: the potential quantity (tonnage) and grade of the Exploration Target is conceptual in nature. There has been insufficient exploration to estimate Mineral Resources and it is uncertain if further exploration will result in the estimation of Mineral Resources.

 

The calculation was restricted to prospects for which there is good evidence of mineralisation orientation and continuity.  Most of these prospects are open along strike and at depth.  A number of other isolated gold intercepts within 10km of Bongou were excluded, so there is significant potential to expand the Exploration Target further within range of PDI’s own drilling.

 

Additionally, PDI’s extensive ground holdings in Eastern Burkina Faso hold other significant prospects for which Exploration Targets could be calculated (e.g. Tambiri, Solna, Bira and Fouli).

 

Locality map of PDI permits near Bongou in eastern Burkina Faso, showing Bongou gold deposit and prospects which make up the Exploration Target Target (note: these drilling results were reported to the ASX in the following Quarterly Reports: June Quarter 2011, March Quarter 2012, June Quarter 2012, March Quarter 2014 and June Quarter 2015. The drill results reported in these Quarterly Reports up to the June Quarterly of 2012 were prepared and first disclosed under the JORC Code 2004; they have not been updated since to comply with the JORC Code 2012 on the basis that the information has not materially changed since it was last reported).

 

Data and parameters used in calculating this Exploration Target were as follows:

  • Data:
    • Gold intercepts from 291 reverse circulation holes, 4 air core holes and 5 diamond drill holes were used in the calculation.
    • The holes were mostly drilled on lines spaced from 50m to 100m apart, with a spacing along the lines ranging from 10m to 50m.
  • Parameters:
    • 0.5 g/t gold cut-off grade;
    • Minimum downhole intercept width of 2m and a minimum grade times width intercept of 2g*m;
    • Minimum internal waste of 3m except for a few holes where it was clear that the holes had drilled almost down-dip and where the inclusion of larger down-hole intervals of internal waste made geological sense;
    • Maximum of 100m strike extent from drill holes (where the continuity of the mineralisation is supported by mapping and/or the location of artisanal workings and/or anomalous auger results);
    • Maximum of 70m vertical extent below surface;
    • Dry bulk density estimates as follows:
      • Laterite: 2.2
      • Saprolite: 1.8
      • Weathered rock between base of saprock and base of complete oxidation (BOCO): 2.3
      • Fresh mafic volcanics: 2.8
      • Fresh felsic to intermediate rocks including granite and granodiorite: 2.7
    • The calculation was carried out using a cross sectional method with volumes projected half way to the next hole (on the section) or half way to the next section to a maximum distance of 100m (along strike).

The largest component of the Exploration Target comes from the Dave prospect (see drill plan below).

 

Plan view of drill intercepts – Dave Prospect (results reported in Quarterly Reports to ASX of September 2011, March 2012, June 2012, Sept. 2012. This information was prepared and first disclosed under the JORC Code 2004. It has not been updated since to comply with the JORC Code 2012 on the basis that the information has not materially changed since it was last reported).

 

Other prospects – Tambiri permit

 

Longitudinal projection of drill results – Tambiri prospect (drill results reported to the ASX in Quarterly Reports of June 2011, December 2011, March 2012, June 2012. This information was prepared and first disclosed under the JORC Code 2004. It has not been updated since to comply with the JORC Code 2012 on the basis that the information has not materially changed since it was last reported).

 

Plan view of drill results, Solna prospect, Tambiri permit (drill results reported to the ASX in Quarterly Reports of June 2011, December 2011, March 2012, June 2012, March 2013. This information was prepared and first disclosed under the JORC Code 2004. It has not been updated since to comply with the JORC Code 2012 on the basis that the information has not materially changed since it was last reported).

Subscribe to PD's Newsletter and receive company announcements

Current Share Price

ListedCompanyEmblem

Predictive Discovery's ASX code is PDI and the current share price can be found here.