Pebble Project Geochemical Characterization Stephen Day Claire Linklater SRK Consulting November 27, 2007 Anchorage.

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Presentation transcript:

Pebble Project Geochemical Characterization Stephen Day Claire Linklater SRK Consulting November 27, 2007 Anchorage

Geology Map Each dot is a drill hole

Geological Cross-Section

Geology (Cretaceous)

2007 Program Objectives Continue characterization of West Zone. Characterization of East Zone. Evaluate leaching under non-acidic conditions from Tertiary rocks Characterization of tailings produced in 2007 from East Zone.

West Zone in 2007 In-fill drilling for exploration. Ongoing rock humidity cells (up to 2.5 years). –Two Cretaceous –Seven Tertiary Four ongoing rock subaqueous columns (2 years). Two ongoing low-sulfide tailings columns and two humidity cells (2.5 years).

East Zone Sample selection – Static Testwork Criteria designed to ensure samples covered range in: –Rock type –Spatial variability –Geochemical characteristics (sulfur, metal content). –Calcium used as a surrogate for neutralization potential. Cretaceous (200 samples) –180 samples below copper equivalent of 0.6%. –20 samples above copper equivalent of 0.6%. Tertiary (200 samples) – bimodal sulfur distribution –180 representing typical sulfur content. –20 representing higher sulfur content (>1%).

Sulfur in East Zone Tertiary Rocks

East Zone Sample selection – Kinetic Testwork Humidity Cells –Subset of samples studied in static testwork program 12 Cretaceous 11 Tertiary –Samples selected by: Ranking dataset according to sulfide-S content For each lithology, selected samples with (i) low, (ii) average, (iii) high, and (iv) highest sulfide-S content

Confirmation of Analytical Surrogates Used to Select Samples (Cretaceous) Dashed lines indicate NP/AP=2

Confirmation of Analytical Surrogates Used to Select Samples (Tertiary) Dashed line indicates NP/AP=2

Acid-Base Accounting Results: East Zone Cretaceous (I)

Acid-Base Accounting Results: East Zone Cretaceous (II)

Acid-Base Accounting Results: East Zone Tertiary

Comparison of AP results for East & West Zones East Zone samples yielded lower AP values than West Zone

Comparison of NP Results for East & West Zones East Zone samples either equivalent or lower than West Zone Some exceptions in Cretaceous samples: –Higher median values wacke/sandstone

Comparison of NP/AP Results For Pebble East & West Zone Overall conclusions same for East and West: –Cretaceous mineralized rocks are mainly PAG. –Tertiary rocks are mainly non-PAG. Median NP/AP for East Zone often greater than West Zone.

Field Weathering Tests

Barrel #AgeZoneRock Types 1TertiaryEastAndesite/Basalt 2 & 3 – DuplicatesTertiaryWestAndesite/Basalt 4TertiaryEastDacite 5 & 6 - DuplicatesTertiaryWestConglomerates 7TertiaryEast+WestWacke/sandstone 8TertiaryEast+WestMudstone 9 & 10 - DuplicatesCretaceousWestIntrusive rocks 11 & 12 - DuplicatesCretaceousWestSedimentary rocks Blank, left empty

Conclusions from 2007 Program East Zone showing similar results to West Zone –Cretaceous mineralized rock is mainly PAG. –Tertiary rock is mainly non-PAG.