Summary
Overview
Work History
Education
Skills
Affiliations
REFERENCE
Timeline
Generic
Rinaldi ST

Rinaldi ST

Senior Project Geologist
Yogyakarta

Summary

I am a field-oriented geologist with over 18 years of experience in the exploration of copper–gold and base metals at various project stages, ranging from greenfield exploration to near-mine and development projects in Indonesia, Cambodia, and Japan


Strong technical expertise in Porphyry Cu-Au, Skarn, Sediment-Hosted, and LS-IS and HS Epithermal Au deposits.

Overview

19
19
years of professional experience

Work History

Senior Project Geologist

PT. Serambi Timur Resources
08.2024 - Current
  • Conducted regional to detailed geological and alteration mapping to support exploration targeting and project evaluation.
  • Interpreted and compiled geological, structural, alteration (surface mapping combined with ASD), stockwork intensity, and geochemical (rock and soil) data to define and prioritize drill targets.
  • Supervised more than 50 field crew members, drilling and geophysics contractors, and three national geologists.
  • Prepared weekly and monthly geological report
  • Ensured all core shed geological activities were carried out in compliance with SOPs and safety protocols

Senior Geologist

Japan Gold
09.2019 - 07.2024
  • Conducted regional to detailed geological and alteration mapping to evaluate epithermal low-sulphidation deposit targets across Japan (Hokkaido, Kyushu, and Honshu), contributing to exploration targeting and project development

Senior Geologist - Exploration Manager

PT. Tri Usaha Baru
07.2017 - 08.2019
  • Led and conducted exploration programs, managing activities such as geological mapping, geochemical sampling, drilling, core logging, data interpretation and compilation, and preparation of technical reports.
  • Discovered and advanced the main Dokodokoto prospect (ISE overprinted with LSE deposit), progressing from detailed mapping and scout drilling to resource delineation drilling, while also identifying additional prospects within the Tenement/IUP.

Senior Geologist

J Resources Bolaang Mongondow
09.2016 - 05.2017
  • Conducted district-scale geological and alteration mapping to support exploration targeting, prospect evaluation, and drill program planning

Project Geologist

Geopacific Resources
11.2014 - 09.2016
  • Conducted detailed geological and alteration mapping, reverse circulation (RC) and diamond drilling, and core logging to evaluate epithermal Au-Cu and VMS deposits in Cambodia, supporting exploration targeting and resource delineation.

Project Geologist

PT. Agincourt Resources (A subsidiary of G-Resources)
07.2013 - 09.2013
  • Conducted regional geological and alteration mapping and sampling to assess porphyry and epithermal high-sulphidation deposit targets, contributing to exploration targeting and project development.

Project Geologist

PT. Citra Palu Minerals (Bumi Resources Minerals)
01.2013 - 06.2013
  • Conducted regional geological and alteration mapping and sampling to evaluate epithermal low-sulphidation and porphyry deposits in Central Sulawesi, supporting exploration target generation and project advancement.

Senior Geologist

PT. Prospindo (Prosperity Resources Ltd)
08.2011 - 12.2012
  • Conducted geological and alteration mapping, diamond drilling, core logging, and sampling to evaluate mesothermal deposits at G. Rosa, Cianjur (West Java), and skarn and porphyry deposits at Tapaktuan, South Aceh, contributing to exploration targeting and project development.

Senior Geologist

PT. Vale Eksplorasi Indonesia
11.2010 - 06.2011
  • Conducted geological and alteration mapping, diamond drilling, core logging, and applied ASD and Niton measurements to assess porphyry deposits at Huu, Bima (East Sumbawa), supporting exploration targeting and resource evaluation.

Exploration Geologist

PT. Prospindo (Prosperity Resources Ltd)
09.2009 - 11.2009
  • Conducted geological and alteration mapping, soil sampling, trenching, ground and aeromagnetic surveys, diamond drilling, core logging, and sampling to evaluate skarn and porphyry deposits in South Aceh, epithermal low-sulphidation vein systems at G. Julang (West Java), and regional porphyry systems in Sorong (West Papua), contributing to exploration targeting and project development.

Exploration & Development Geologist

PT. Indomuro Kencana Minerals (Straits Resources Ltd)
07.2008 - 09.2009
  • Conducted geological and alteration mapping, soil sampling, trenching, Wacca drilling, diamond and reverse circulation drilling, core logging, and sampling to evaluate epithermal low-sulphidation deposits at the Mt. Muro Gold Project (Central Kalimantan), supporting exploration, resource delineation, and project development.

Exploration Geologist

PT. Sorikmas Mining (Oropa Limited)
11.2007 - 05.2008
  • Conducted geological and alteration mapping, trenching, test pitting, core logging, and sampling to evaluate sediment-hosted and epithermal low-sulphidation deposits at the Pungkut Project (South Tapanuli, North Sumatra), contributing to exploration targeting and resource delineation.

Junior Exploration Geologist

PT. Indonusa Mining Services (Austindo Resources Coorporation)
05.2006 - 11.2007
  • Conducted geological and alteration mapping, soil sampling (conventional and mobile metal ion/MMI), trenching, test pitting, core logging, and sampling to support epithermal gold exploration programs.
  • Contributed to multiple epithermal gold projects, including Cibaliung (West Java), Pekalongan (Central Java), and Trenggalek (East Java), through field mapping, sampling, and drilling activities.

Education

Bachelor Degree - Geological Engineering

Universitas Pembangunan Nasional “Veteran"
Yogyakarta
2006

Skills

Regional to detailed geological and structural mapping

Interpretation of geology, alteration, geochemistry, and geophysics for drill targeting

Core handling

Logging and analysis of drill core data

Proficient in geological software such as ArcGIS Pro, Leapfrog, Oasis montaj, and MapInfo

QA/QC for core data such as ASD, Niton, Magsus and density

Fluent in Bahasa Indonesia and English

Affiliations

  • 2001 – 2005, Crystallography and Mineralogy Laboratory Assistant
  • 2002 – 2005, Petrology Laboratory Assistant
  • 2003 – 2004, Mineral optic Laboratory Assistant
  • 2003 – 2004, Mineral deposit Laboratory Assistant
  • 2003 – 2005, Petrography Laboratory Assistant

REFERENCE

Andrew Rowe, VP Exploration at Japan Gold Corp, +62 811 1830 904

Prayogo Hargyono, Exploration Manager at Straits Resources and Geopacific resources , +62 812 8948 3854


Timeline

Senior Project Geologist

PT. Serambi Timur Resources
08.2024 - Current

Senior Geologist

Japan Gold
09.2019 - 07.2024

Senior Geologist - Exploration Manager

PT. Tri Usaha Baru
07.2017 - 08.2019

Senior Geologist

J Resources Bolaang Mongondow
09.2016 - 05.2017

Project Geologist

Geopacific Resources
11.2014 - 09.2016

Project Geologist

PT. Agincourt Resources (A subsidiary of G-Resources)
07.2013 - 09.2013

Project Geologist

PT. Citra Palu Minerals (Bumi Resources Minerals)
01.2013 - 06.2013

Senior Geologist

PT. Prospindo (Prosperity Resources Ltd)
08.2011 - 12.2012

Senior Geologist

PT. Vale Eksplorasi Indonesia
11.2010 - 06.2011

Exploration Geologist

PT. Prospindo (Prosperity Resources Ltd)
09.2009 - 11.2009

Exploration & Development Geologist

PT. Indomuro Kencana Minerals (Straits Resources Ltd)
07.2008 - 09.2009

Exploration Geologist

PT. Sorikmas Mining (Oropa Limited)
11.2007 - 05.2008

Junior Exploration Geologist

PT. Indonusa Mining Services (Austindo Resources Coorporation)
05.2006 - 11.2007

Bachelor Degree - Geological Engineering

Universitas Pembangunan Nasional “Veteran"

Similar Profiles

CREATE PROFILE
Rinaldi STSenior Project Geologist