Geophysical datasets, namely, electrical resistivity, induced polarization, magnetic susceptibility were measured and aeromagnetic interpreted on the Subika concession of Newmont Ghana Gold Limited in order to delineate and model the zone of gold mineralization. The electrical resistivity and induced polarization results delineated the gold mineralized zone as a narrow discrete resistor (>4900 ohm m) and high chargeability (>7.2 ms) zone with a strike length of about 2 km. A strip log plots of 12 diamond drilled core samples showed the zone of mineralization with high alteration and low magnetic susceptibility. Analysis of laboratory magnetic susceptibility measured on selected samples from the pit and selected core samples from the mineralized zones showed a negative correlation between the magnetic susceptibility and gold grades with a correlation coefficient of -0.2 and -0.74, respectively. Similarly, magnetic depth slice produced from the 3D model of the aeromagnetic data depicts the zone of gold mineralization with a low magnetic signature. The zone mineralization was also observed to be striking in the north-east direction. Mineralogical analyses of rock samples revealed alteration processes such as carbonization, sericitization, silicification, chloritization and sulphidation resulting from hydrothermal alteration which accounted for the low magnetic and the magnetic susceptibility signatures of the mineralization zones. The strong resistivity and chargeability response of the mineralized zones are therefore attributed to the silicification and sulphidation alteration, respectively. The results show the effectiveness of applying integrated geophysical, petrophysical as well as mineralogical study in revealing gold mineralization potential of the Subika deposit and the Sefwi belt as a whole.
Results of analyses on localized jointing system are presented to study the link of groundwater inflow and joint orientations along the 2000 m excavation of Tunnel Boring Machine (TBM-1) site, Karak in conjunction with the construction of Pahang-Selangor Raw Water Transfer Tunnel project. Geology along the tunnel route is predominantly the Main Range Granite Batholith with a lesser extent of metasedimentary rocks of the Karak Formation. Structurally, TBM-1 is dominated by joints oriented at N-S, NW-SE, and NE-SW directions. Strike slip faults that cross-cut the intrusive Main Range Granite rocks trending faults formed the most prominent structures in the vicinity of the Karak. This section of tunnel alignment consists of 2000 meters in length of Ch.8,821.77 m to Ch.10,821.77 m; 456 joints were mapped to create anisotropic conditions of rock section. Eleven significant locations experienced stoppages, thereby affecting the TBM daily progress, and such stoppages were mainly caused by sudden high-pressure groundwater inrushes or wet joint condition. Potential leakage places are identified by three main types of joints orientations. The most permeable tunnel section is in parallel with the main lineament orientation, followed by perpendicular to the tunnel drive direction, and crossing some voids that create pocket water zones.
Figure 1Figure 21. Tell us about your work at the Swedish Museum of Natural HistoryFigure 1. Ellen Kooijman.Figure 2. In the Vegacenter.I work as a Senior Researcher in isotope geology and I am hea...
Figure 1Figure 2Figure 31. What is your background and experience? How did you get to the role that you are in today?I’m a geographer—I have a BA & PhD in geography and an MS in ecology. I’ve speci...
Santhiagu A, India Emmanuel Mawuli Abalo, Ghana Fidelis Abam, Nigeria Akbar Abbasi, Cyprus Haider Abd, Iraq Saleh Abd El-Aleem, Egypt Juman Abdeen, Sri Lanka Shehata Abdel Raheem, Saudi Arabia Abdelhakim Abdelhadi, Saudi Arabia Sbihi Abdelkader, France Oday Abdullah, Germany Dr Rozi Abdullah, Malaysia Basma Abbas Abdulmajeed, Iraq Alessandro Abena, United Kingdom Mohamed Abosaf, United Kingdom Omar Abu Arqub, Jordan Ahmed Abul’Wafa, Egypt Leonardo Acho, Spain Olusola Adesina, Nigeria Olanrewaju Adesusi, Nigeria Philip Adewuyi, Nigeria Michael Kanisuru Adeyeri, Nigeria Behnam Adhami, Islamic Republic Of Iran Hojjatollah Adibi, Islamic Republic Of Iran Daniel Adu, China George Affenzeler, United States Richard Afolabi, Nigeria Neelofar Afzal, India Pradeep Agarwal, India Aaron Agbo, Ghana Olayinka Agboola, Nigeria Stephen Agyeman, Ghana Abdalqader Ahmad, United Kingdom Muhammad Abbas Ahmad Zaini, Malaysia Syed Hassan Ahmed, China Farooq Ahmed, Pakistan Morteza Aieneravaie, Islamic Republic Of Iran Abel Airoboman, Nigeria Abiola Ajayeoba, Nigeria Priya Ak, India Ali Akbari Motlagh, Islamic Republic Of Iran Andac Akdemir, Turkey Basil Akinnuli, Nigeria Isabelle Akkerman, Germany Mudathir Akorede, Nigeria Alireza Akrami, Islamic Republic Of Iran Isam Al Zubaidi, Canada Guido Ala, Italy Ahmed Abdulamier Hussain Al-Amiery, Malaysia Alma Y. Alanis, Mexico Mohamed Al-Ashhab, Egypt Rawaa Al-Dabbagh, Iraq Alessio Alexiadis, United Kingdom Lokman Ali, Bangladesh Javed Ali, Germany M. D. S. Aliyu, Saudi Arabia Farideh Alizadeh, Malaysia Hassan Aljaberi, Malaysia Dhiya Al-Jumeily, United Kingdom Ghazaleh Allameh, Islamic Republic Of Iran Sana Almi, Algeria Karam Al-Obaidi, Malaysia Francisco Alonso, Spain Ehab Alshamaileh, Jordan Wisam Al-Shohani, United Kingdom Luis Alvarez-Icaza, Mexico Baurzhan Alzhanov, Kazakhstan Hussein Alzoubi, Jordan Amirmostafa Amirjani, Islamic Republic Of Iran Mutiu Amosa, South Africa Sanjeev Anand, India Yatheshth Anand, India Vivek Anandaan, India Parinya Anantachaisilp, Thailand Pradeep Anjana, India Sadiya Anjum, India Iyswarya Annapoorani, India Eugene Ansah, Ghana Kashif Ansari, India Mohammad Khalid Ansari, India Emmanuel Anye Ngang, United Kingdom Zoubir Aoulmi, Algeria Amir Arablouei, United States Dominique Armellini, Canada Yogendra Arya, India Tatsunori Asaoka, Japan Nestor Asiamah, Ghana Alireza Aslani, Finland Nikos Aspragathos, Greece Samuel Asumadu-Sarkodie, Ghana Abdullah Ates, Turkey Youssef Attai, Egypt Farnaz Avarzamani, Islamic Republic Of Iran Wael Awad, Jordan Hediye Aydın, Turkey Sohail Ayub, India Faieza Aziz, Malaysia Nagarajan B, India B.Chitti Babu, India Sudhakar Babu, India Senior Editors, Cogent Engineering (2018), 5: 1433607 https://doi.org/10.1080/23311916.2018.1433607
