Post on 09-Jul-2022
Project Checo de Cobre
(Cu-Au)
Junio/2020
Location/ Regional Geology
Project Checo de Cobre
Sernageomin (2003)
Project summary
LocationIII Region , located 25km away southeastward from Copiapó and is also located 15km away southeastward from
Candelaria Mine.
Mining property100% Minera Nittetsu Chile Ltda.. 19 exploitation concessions cover 3,862 ha, named as Hitachi 1 to Hitachi 7,
Siciliano 1 to Siciliano 5, Checo 3 to Checo 6A, Jun 3, Jun 6, Jun 7
Access by land Takes 1 hours by 4×4 vehicle from Copiapó.
Type of mineralization IOCG Stratabound / IOCG vein type (Cu-Au)
ASTER analysis A promising large strong acid alteration was extracted
Geology
The Upper Cretaceous andesites (Cerrillos Formation) is widely distributed in the western part, and the Upper
Cretaceous basalts (Hornitos Formation) is distributed in the eastern side inconsistent with the Cerrillos
Formation. The Cabeza de Vaca granitic intrusion (63-59Ma) intrudes into the Hornitos Formation.
There are more than 100 small-scale mining sites in the area.
Geochemical survey
Stream sediment geochemistry (160 samples), Rock-chip geochemistry (576 samples), Trench geochemistry,
Dating, Petrography, XRD
(ex. Rock chip sample maximum: 10%Cu, 18g/tAu etc)
Geophysical survey AMT (8 km), Ground Mag (131 km), Airborne Mag (630 km)
Drilling
43hole, totaling 17,740m
CCDA-1:12m(556-568m)@1.67%Cu, 0.26 g/tAu, 7.50 g/tAg
CCDA-3:17m(160-176m)@2.90%Cu, 158 g/tAg
CCR-003:8m(90-98m)@0.58%Cu, 3.84 g/tAu
Target size Unknown
Geological map of Checo de CobreColor composite image (RGB=468) of Checo de Cobre
ASTER analysis/ Local geology
Geochemical surveyThe geological and geochemical survey were
done in 2017.
771 samples were analyzed multiple elements
using 4 acid dilution method at ALS.
From the results of geological and
geochemical exploration revealed that
numerous copper mineralization zones
exceeding 2%Cu were identified on the surface,
maximum grade of Cu: 10.3%, Au: 18g/t, and
specified three prospects.
[ Western prospect ]
• Satratabound Mgt-Cu(ox) mineralization in
carbonate (marl) layer
• Mgt-Qz-Cal veins with Cu(ox) minerals
[ Eastern prospect ]
• Qz-Cal-Lim-Hm veins with Cu(ox)-Au
minerals
[ Central prospect ]
• Strong silicified and argelized (Kao-Ser)
alternated zone like advanced argillic
alteration
Eastern prospect
Central prospect
Western prospect
Geophysical survey
• The high magnetic anomalies trending NW-SE direction presents in the western and central prospects.
• In the eastern prospects, relatively medium to low magnetism was distributed.
Western prospectCentral prospect
Eastern prospect
The RTP imaged obtained by Airborne magnetic survey The RTP imaged in the western prospect by ground magnetic survey
Drilling (1. Western prospectManto type mineralization)
A
A’
CCDA-1:12m(556-568m)@1.67%Cu
CCD-011:13m(605-618m)@0.66%Cu
1㎝
CCD-011 612.20-612.29m:Mgt – Py – Cp
• The drilling intercepted 2 mineralized layers composed Mgt-Py-Cp up to 15m thickness. ( ex. CCDA-1:12m(556-568m)@1.67%Cu, 0.26 g/tAu, 7.50 g/tAg )
• This Mgt layers are continuously conceived in the marl layer, which seems corresponding to
the high magnetic anomalies.
• Despite indicating a high magnetic anomaly, there are still some areas that have not been
drilled.
HoleID Zone Analized zone Cu(%) Au(ppm) Ag(ppm)
CCDA-3 AH 3-22m(19m) 1.17 0.02 45.0
AG 102-116(14m) 0.99 0.01 39.0
AF 160-177(17m) 2.90 0.01 158.0
CCDA-6 AG 80-85m(5m) 1.09 <0.01 58.0
CCDA-7 AF 89-92m(3m) 0.22 <0.01 11.7
CCDA-8 AH 4-18m(14m) 0.64 <0.01 17.0
AG 90-107m(17m) 0.67 <0.01 32.0
AF 159-164m(5m) 2.15 <0.01 106.0
CCD-013 AH 284-286m(2m) 0.76 0.08 39.3
AG 365-367m(2m) 0.22 <0.01 15.9
AF 446-449m(3m) 2.76 0.05 207.4
CCD-013 447.10-447.20m:Bo-Cc dissemination
1㎝• The prospect with many small scale Cu(ox) mines on the surface is presented.
• Multiple drillings confirmed copper mineralization containing Bo-Cc, which have characterized
by rich Cu-Ag grades.( ex. CCDA-3:17m (160-176m) @2.90%Cu, 158 g/tAg )
• The mineralization has been confirmed that continues from the surface to a depth of 300 m,
and toward the deeper part is open.
A
B
Mineralized zone
Drilling (2. Western prospectBreccia type mineralization)
Qz-Lim vein
Cp
CCR-003 92-94m :Qtz – Lim - Cp
CCD-019CCD-018
CCR-003
CCD-028
CCD-030
CCD-029
Drillhole Analized zone Cu ppm Au ppm Ag ppm
8m (90-98m) 0.58 3.84 8.39
6m (110-116m) 0.90 1.19 13.1
CCD-019 6m (178-184m) 0.28 2.18 0.94
CCD-028 1m (123-124m) 0.03 2.66 8.65
CCD-029 4m (231-235m) 1.03 0.71 3.82
CCR-003
8m(90 - 98m)@0.58%Cu, 3.84ppmAu6m(110-116m)@0.90%Cu, 1.19ppmAu
• Various Qz-Cal-Hm-Lim veins over 1 km are distributed on the surface, contain high grade Cu and Au.
• Multiple drillings intercepted veins rich in Cu and Au.( ex. CCR-003:8m (90-98m)@0.58%Cu, 3.84 g/tAu, 6m (110-116m) @0.90%Cu, 1.19 g/tAu )
• The mineralization with Cu and Au is continuous down to the depth of at least 100 m from the surface, and the continuity of mineralization to the
deeper part is still open.
A
B
Drilling (3. Eastern prospectCu-Au vein type mineralization)
Drilling (4. Central prospectHydrothermal alteration)
QzPyr
KaoMc
ChlAb
MgtPy
Alteration zone
Porphyry?
Andesite
B
A
• The drillhole CCD-025 was confirmed that the hydrothermal
alteration is distributed continuously to the deeper part, and a
large amount of pyrite as well as gold and copper geochemical
anomalies were found in the shallow silicified zone.
• In the deep part of the silicified zone, magnetite is the main
constituent, accompanied by Na-Ca alteration.
• Alteration and mineral assemblage show similar characteristics
to the IOCG system, it implies that large mineralized zones may
exist in the deep and/or peripheral areas.
Mineralization[ Western zone ]
• The stratabound Cu mineralization in Mgt rich
layers intercepted by various drill holes.
• Three vein type mineralization which are rich in
Cu and Ag hosted in andesite and distributed
continuously from surface to deep.
[ Eastern zone ]
• Cu and Au veins extending from surface to deep
underground like vein type IOCG mineralization.
[ Central zone ]
• Strong silicified and argelized (Kao-Ser)
alternated zone like advanced argillic alteration
• Drilling shows that sodium and calcium
alterations and a large amount of Mgt and Py
disseminations extend to deep from the surface
and resemble like IOCG mineralization.
In the Checo de Cobre project, there are many
mined sites on the surface and interception of many
Cu mineralizations by drilling. The extent of these
mineralizations has not been specified until now,
and there has a potential for mineralization to
expand in underground.
Eastern prospect
Central prospect
Western prospect