9 00-9-20stephaneamireault
9 00-9-20stephaneamireault
9 00-9-20stephaneamireault
Dr. Stewart D. Redwood
Consulting Geologist
Panama www.medororesources.com
www.sredwood.com
ProEXPLO Peru, 8 February 2011
Estimated 2.3 Moz
st ated 3 o Au extracted
u e t acted
Quimbaya mining and goldsmiths
(500 BC – 1600 AD)
Spanish mining 1532‐1825
p g 53 5
1825‐1925 – English junior
companies
From 1925 –
9 5 g government
Mineros Nacionales, Zona Baja ‐
1993‐present
Conquistador & Gran Colombia –
q
mid‐1990s
Colombia GoldFields & Colombia
Gold plc – 2005‐2009
Medoro Resources Ltd –
consolidated project 2010
Poporo Quimbaya, 0‐600 AD
b
Museo de Oro, Bogota
MARMATO MEASURED AND INDICATED GOLD AND SILVER MINERAL
RESOURCES
6 January 2011
MEASURED RESOURCES
GOLD SILVER
Cut off Tonnes (m) Grade g/t Ounces (m) Grade g/t Ounces (m)
grade g/t Au Ag
Au
0 30
0.30 34 1.0
1 0 11
1.1 82
8.2 9
INDICATED RESOURCES
0.30 192 0.9 5.5 4.6 28
TOTAL MARMATO MEASURED AND INDICATED MINERAL RESOURCES
0 30
0.30 226 09
0.9 66
6.6 51
5.1 37
NI 43‐101 Qualified Person – Ben Parsons, SRK Consulting (UK) Ltd.
Marmato
Cediel & Caceres, 2000; Cediel et al., 2003
Middle Cauca
Titiribi Gold Belt
Geology and
L Mi
La Mina
Gold Deposits
Quebradona
Intermediate
sulfidation
O Fino
Oro Fi epithermal gold
Yarumalito deposit
Marmato
Porphyry
Au‐(Mo‐Cu)
Quinchia
deposit
Miraflores
Porphyry ages 7.1 +/‐ 0.2 to 6.3 +/‐ 0.7 Ma (Gonzalez, 1980;
R di
Rodriguez, 1987; Vinsaco, 2001)
8 Vi )
Sericite age 5.6 +/‐ 0.6 Ma (Pinzon & Tassinati, 2003)
Marmato Project Geology
Section 3700 (SW – NE)
Evolution of magmatism, alteration and
Evolution of magmatism alteration and
Mineralization with time
Country Rock
Black, graphite schist with
q
quartz segregations.
g g
Strongly folded.
MT‐1084, 46.0m.
Graphitic schist and beds
of sericite‐carbonate
schist.
MT‐1084
MT 1084, 41.8m.
41 8m
P D it
P1 Dacite
P2 Dacite. Less croweded
P2 Dacite Less croweded phenos. Small elongate qz. Plag, euhedral
phenos Small elongate qz Plag euhedral bt, minor hb.
bt minor hb
Weak chl alteration of mafics with dissem po, py, and weak pervasive illite.
ECH‐12, 144.9 m. 1.5 m at 0.07 g/t Au.
P3 Andesite
P4 Andesite
4 dike with plag, bt, hb. Weak chlorite –illite
p g, , alteration with veinlet py
py‐ca.
MT‐1052m, 62.0 m.
P5 Dacite
Unidirectional solidification texture (UST) in P2 dacite in contact with P1 dacite.
Miarolitic Cavities
Miarolitic cavities (pockets of fluid in crystallizing porphyry) with fill of calcite‐pyrite,
Halo of chlorite grading out to illite with weak illite pervasive alteration. In P2 dacite.
ECH‐12, 278.2 m.
Phreatic Breccia
P1 dacite with
weak alteration of bt to
chlorite. Cut by zone of
ep‐chl‐albite .
MT 1002, 195.5 m.
MT‐1002, 195.5 m.
2.0m – 0.010 g/t Au.
Illite ‐ Smectite
Pervasive illite alteration in P1 dacite.
Non‐continuous veinlets
Non continuous veinlets illite
illite‐py‐sp (brown and black) –
py sp (brown and black) overprint of propylitic veinlets.
veinlets
MT‐1043, 103.8 m. 2.0 m at 0.53 g/t Au, 4.8 g/t Ag.
Stage 1. Veinlets
Stage 1 Veinlets ep
ep‐chl‐alb‐ca‐po
chl alb ca po /py
/py‐black sp related to propylitic
black sp related to propylitic
alteration. Irregular, short veinlets. Minor Au mineralization (0.1 to
0.3 g/t).
Stage 2. Veinlets to veins massive sulfides
Pyrite, black sphalerite, minor galena, Pb
Pyrite black sphalerite minor galena Pb‐Ag sulfosalts
Ag sulfosalts.
Also pyrrhotite, arsenopyrite.
Minor gangue quartz, calcite, ankerite,sericite.
High grade Au+Ag.
Related to quartz‐sericite‐illite alteration.
Veins related to Riedel shear, tensional, often open space, breccia,
massive, coarse grained.
, g
Structural Plan Marmato 200 m
00 m
140
Note veins projected
from all levels.
800 m
Structures Level 18 (Maruja), 1,160 m
550 m
Red – veins
Blue ‐ faults
Veta Mellizos, Level 18
,
Massive sulfide vein with quartz center
3 5 g/t Au over 1 20 m
3.5 g/t Au over 1.20 m
Stage 1 Veinlets
g
Stage 1 veinlets py‐sp‐ca with chlorite halo and outer halo illite.
In P1 dacite with later pervasive illite alteration.
MS 001 41 3 m 2 0 m at ? Au
MS‐001, 41.3 m. 2.0 m at ? Au.
Stage 1 & Stage 2 Veinlets
Brittle Riedel shear structure of stage 2 py‐sp‐qz veins in P1 dacite.
NE trending ein ith right lateral dilation
NE‐trending vein with right lateral dilation.
Halo of qz‐ser alteration. Cuts earlier chl‐ep‐?albite alteration with stage 1 narrow sulfide vts.
Echandia ECH‐05, 249.8 m.
Major intermediate sulfidation epithermal
deposit
+10 Moz
0 Mo Au A
Hosted by multiple porphyry intrusions
Gold late stage
Regional structural control on mineralization
Distal to porphyry gold system
Analogs – Kori Kollo, Bolivia (5.2 Moz at 2.3 g/t)
Gracias ‐ Thank you!
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