Geoscience Reference
In-Depth Information
Table 4.1
Original and simpli-
fied geologic codes, Escondida
database
LITHOLOGY
GROUPING
Alpha CODES
Numeric Codes
K-Porphyry
OK
PF
1
Grouped with Tuffs
PC
2
Quartz-Porphyry
Undifferentiated Porphyry
Ignore
PU
-99
Andesite
OK
AN
3
Igneous Breccias
Grouped with PF
BI
4 (1)
Grouped with other PF
BH
7 (1)
Hydrothermal Breccias
Tectonic Breccias
Ignore
BT
-99
Gravel and Pebble Dykes
Ignore
GR/PD
-99
Late Dacite
Ignore
DT
-99
Ignore
DR
-99
Diorite
Tuff
Grouped with PC
TB
2
MINERALIZATION TYPES
GROUPING
Alpha Codes
Numeric Codes
Leach
OK
LX
0
OK
OX
1
Green Cu Oxides
Cuprite
Grouped with other Cuprite
CP
2
Cuprite + Ox Cu
Grouped with other Cuprite
CPOX
2
Cuprite + Mixto
Grouped with other Cuprite
CPMX
2
Cuprite + Cc + Py
Grouped with other Cuprite
CPCCPY
2
Partial Leach
OK
PL
4
Mixed Oxide and Sulfides
OK
MX
5
Chalcocite/Pyrite
Grouped with HE2
HE1
6
Chalcocite/Covelite/ Pyrite
Grouped with HE1
HE2
6
Covelite/Pyrite
Grouped with LE
HE3
7
Chalcocite/Chalcopyrite/
Pyrite
Grouped with LE
LE1
7
Chalcocite/Covelite/
Chalcopyrite/Pyrite
Grouped with LE
LE2
7
Covelite/Chalcopyrite/
Pyrite
Grouped with LE
LE3
7
Pyrite
Grouped with other Primary
PR1
8
Chalcopyrite/Pyrite
Grouped with other Primary
PR2
8
Bornite/Chalcopyrite/
Pyrite
Grouped with other Primary
PR3
8
ALTERATION
GROUPING
Alpha Codes
Numeric Codes
Fresh rock
Ignore
F
-99
Propilitic
Grouped with SCC
P
2
Clorite-Sericite-Clay
OK
SCC
2
Quartz-Sericite
OK
S
1
Potassic
OK
K
3
Biotitic
Grouped with K
B
3
Advanced Argilic
Grouped with S
AA
1
Clay
Grouped with S
AS
1
Silicified
Grouped with S
Q
1
K-S Transition in Porphyry
Grouped with SCC
QSC
2
SCC Silicified in Andesite
Grouped with SCC
SCC-An
2
QSC Silicified in Porphyry
Grouped with SCC
SCC-Pf
2
Fig. 4.1
Diagram showing the
four structural domains. Domain
5 (in brown, west of the Ferrocar-
ril fault) is non-mineralized, and
outside the area of interest. For
scale, the projection of the 2001
pit to the surface has an approxi-
mate dimension of 3 × 3 km, and
no vertical exaggeration
