Summary
Overview
Work History
Education
Skills
Certification
Timeline
Generic

Yohana Silas Malaki

Summary

Engineering Geologist with experience in mineral exploration, geological modeling, and resource evaluation for gold, diamonds, nickel, coal, and graphite, having worked within Archean greenstone belts, Paleoproterozoic, and Phanerozoic geological settings. He has expertise in geological mapping, core logging, sampling, drill hole planning, and QA/QC procedures, contributing to accurate resource models. He has a proven ability to manage field teams, ensure precise data collection, and provide actionable insights that enhance project success.

Overview

5
5
years of professional experience
1
1
Certification

Work History

Geologist

Shanta Mining Company Limited
09.2024 - Current
  • Supervised RC and DD drilling and conducted geological logging and sampling
  • Managed data storage and regularly updated various maps and sections
  • Conducted visual estimates of minerals in RC hole chip samples, ensuring adherence to QC/QA protocols for grade control and dynamic resource model input
  • Conduct detailed geotechnical logging for both oriented and non-oriented core samples to evaluate subsurface conditions

Resource Development Geologist

Sotta Mining Corporation Limited
01.2024 - 09.2024
  • Supervised drilling operations and core logging, ensuring accurate geological modeling
  • Conducted QA/QC protocols for drilling, sampling, and geotechnical data collection
  • Assisted in cross-section development for active drill programs supporting resource definition
  • Conducted visual estimates of minerals in RC hole chip samples, adhering to QC/QA protocols
  • Developed exploration plans, identified promising mineral targets, and optimized exploration methods for resource potential

Geotechnical Engineer

Pejuni Resource Limited
01.2023 - 01.2024
  • Reviewed previous geotechnical reports and databases, identifying gaps to plan infill drilling and data collection
  • Supervised drilling and conducted core logging, sampling, and borehole Acoustic Televiewer
  • Conducted rock mass classification (RMR, Q, GSI) and Applied empirical, analytical, and numerical methods for ground support and remediation design
  • Led geotechnical site investigations for proposed TSF, refinery, waste dump, and processing plant sites, overseeing drilling supervision, core logging, soil profiling, sampling, and in-situ testing
  • Supervised drilling at the tailings dam embankment and installed survey monuments, moisture meters, and piezometers for groundwater and soil moisture monitoring
  • Assessed the availability and suitability of construction materials for the dam embankment within and beyond the project area
  • Prepared detailed weekly and monthly technical reports based on drilling investigations and laboratory results

Engineering Geologist

Paulsam Geo-Engineering Limited
01.2022 - 01.2023
  • Supervised drilling programs, identifying key resource potential areas to enhance project viability
  • Conducted engineering geological interpretation and rock mass discontinuity surveys of drill cores
  • Led field investigations, analyzing soil and rock formations, performing geological mapping, and collecting samples for laboratory analysis
  • Successfully managed cost-effective geological investigations, increasing resource identification efficiency and reducing project costs
  • Developed effective drill plans, optimizing resource extraction and ensuring accurate geological modeling and resource development

Geological Engineer

Arab Contractors - JV-AC-EE
11.2020 - 01.2022
  • Conducted geotechnical mapping for dam foundations, tunnels, and slopes
  • Supervised test pit excavation, soil profiling, and laboratory testing for construction material assessments
  • Assisted in ground support system design for tunnels and underground structures
  • Inspected ongoing construction work and ensured compliance with all design standards
  • Performed in-situ testing for dam foundation and embankment dam
  • Discovered and evaluated new soil borrow areas, increasing construction material availability by 10%

Engineering Geologist Trainee

Petra Diamonds, Williamson Diamond Limited
07.2020 - 11.2020
  • Managed data storage and regularly updated various maps and sections
  • Managed the geotechnical aspect of a Tailings Storage Facility, ensuring compliance with environmental and safety standards
  • Utilized GeoStudio Software for seepage, slope stability, and liquefaction assessments of the Slimes dam
  • Conducted engineering geological mapping at the pit site, including pit face mapping, slope stability analysis, and daily pit inspections
  • Supervised water well drilling, logged soil and rock horizons, and determined hydrogeological properties through pumping tests

Education

Bachelor of Science - Engineering Geology

University of Dar es Salaam
01.2020

Skills

  • Geological Mapping
  • Core logging
  • Sampling
  • Geological Modeling
  • Field Works
  • Drill holes planning
  • Mineral Exploration
  • Structural Geology
  • Geophysical Survey
  • Risk Assessment
  • Project Managements
  • Technical Reporting
  • ArcGIS
  • Global Mapper
  • DeswikCAD
  • Leapfrog Geo
  • Dips
  • Micromine
  • Surfer
  • Strater
  • Communication
  • Teamwork
  • Detail-oriented
  • Problem Solving Skills

Certification

  • Leapfrog Edge Resource Estimation Fundamentals, Seequent Limited, 01/24
  • Leapfrog Geo Fundamentals, Seequent Limited, 12/23
  • Leapfrog Geo Structural modeling, Seequent Limited, 11/23
  • Implicit Geological Modeling by using Micromine, Udemy Training, 10/23
  • Advanced Block Modelling and Resource Estimation by using Micromine, Udemy Training, 05/23

Timeline

Geologist

Shanta Mining Company Limited
09.2024 - Current

Resource Development Geologist

Sotta Mining Corporation Limited
01.2024 - 09.2024

Geotechnical Engineer

Pejuni Resource Limited
01.2023 - 01.2024

Engineering Geologist

Paulsam Geo-Engineering Limited
01.2022 - 01.2023

Geological Engineer

Arab Contractors - JV-AC-EE
11.2020 - 01.2022

Engineering Geologist Trainee

Petra Diamonds, Williamson Diamond Limited
07.2020 - 11.2020

Bachelor of Science - Engineering Geology

University of Dar es Salaam

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Yohana Silas Malaki