title presenter miguel martinez, senior geochemist, als
Post on 27-Jun-2022
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Abstract # 28 Category: Technical developments in exploration including AI / ML studies
Title: Hyperspectral imaging in Pasco Complex and applications in exploration, Cerro Pasco District, Peru
Presenter: Miguel Martinez, Senior Geochemist, ALS
Abstract: After 80 years of industrial-scale mining, the Pasco Complex keeps revealing new styles of
mineralization, new exploration targets, and ultimately, new resources and reserves. This complex is
formed by several types of mineralization formed during the intrusion of Oligocene porphyries into Late
Triassic carbonated rocks (Chambara Formation, part of Pucara Group), including Zn-Pb-Ag-Cu skarn, Pb-
Zn-Ag breccias, Zn-Pb-Ag-Cu±Au intermediate sulfidation polymetallic veins, Pb-Zn-Ag stratabound in
sandstones, and Cu-Au±Mo porphyry.
Recently, hyperspectral core imaging was performed in 3984.5 meters of drill cores from Pasco
Complex, using imaging spectroscopy to collect continuous mineralogy. Two types of product were
generated, image products that preserve the textural context of minerals, and numerical data extracted
from spectral features such as absorptions, in the visible-near infrared and short-wave infrared, and
Reststrahlen peaks in the long-wave infrared.
This presentation shows the results of the hyperspectral imaging and its implications in the exploration
of the district, such as: identification of intrusive pulses associated with early and late alteration of the
Santa Barbara porphyry as a result of the characterization of micas using the shortwave infrared range,
and the use of the longwave infrared range in the differentiation of proximal and distal environments in
the Atacocha skarn and its prograde and retrograde alteration domains.
.
Authors: Aline dos Anjos, NEXA
Mervin Tapia, NEXA
Jonas Mota, NEXA
Miguel Martinez, ALS
Exploration Insights Abstracts Page 28 of 49
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