National geophysical mapping in Geological Survey of India—An impetus to mineral exploration

2022 ◽  
pp. 455-462
Author(s):  
Dinesh Gupta ◽  
J.V. Rama Rao ◽  
V. Ramamurty
Keyword(s):  
Mineral Exploration ◽  
Geological Survey ◽  
Geophysical Mapping

Upernavik 98: reconnaissance mineral exploration in North-West Greenland

1999 ◽  
pp. 39-45 ◽  
Author(s):  
Bjørn Thomassen ◽  
Johannes Kyed ◽  
Agnete Steenfelt ◽  
Tapani Tukiainen
Keyword(s):  
Mineral Exploration ◽  
Mining Industry ◽  
Field Work ◽  
Geological Survey ◽  
Original Series ◽  
West Greenland ◽  
North West ◽  
One Year

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Thomassen, B., Kyed, J., Steenfelt, A., & Tukiainen, T. (1999). Upernavik 98: reconnaissance mineral exploration in North-West Greenland. Geology of Greenland Survey Bulletin, 183, 39-45. https://doi.org/10.34194/ggub.v183.5203 _______________ The Upernavik 98 project is a one-year project aimed at the acquisition of information on mineral occurrences and potential in North-West Greenland between Upernavik and Kap Seddon, i.e. from 72°30′ to 75°30′N (Fig. 1A). A similar project, Karrat 97, was carried out in 1997 in the Uummannaq region 70°30′–72°30′N (Steenfelt et al. 1998a). Both are joint projects between the Geological Survey of Denmark and Greenland (GEUS) and the Bureau of Minerals and Petroleum (BMP), Government of Greenland, and wholly funded by the latter. The main purpose of the projects is to attract the interest of the mining industry. The field work comprised systematic drainage sampling, reconnaissance mineral exploration and spectroradiometric measurements of rock surfaces.

scholarly journals <i>dh2loop</i> 1.0: an open-source Python library for automated processing and classification of geological logs

2021 ◽  
Vol 14 (11) ◽  
pp. 6711-6740
Author(s):  
Ranee Joshi ◽  
Kavitha Madaiah ◽  
Mark Jessell ◽  
Mark Lindsay ◽  
Guillaume Pirot
Keyword(s):  
Open Source ◽  
Mineral Exploration ◽  
String Matching ◽  
Drill Hole ◽  
Geological Survey ◽  
Database Structure ◽  
Automated Processing ◽  
Study Case ◽  
Textual Form

Abstract. A huge amount of legacy drilling data is available in geological survey but cannot be used directly as they are compiled and recorded in an unstructured textual form and using different formats depending on the database structure, company, logging geologist, investigation method, investigated materials and/or drilling campaign. They are subjective and plagued by uncertainty as they are likely to have been conducted by tens to hundreds of geologists, all of whom would have their own personal biases. dh2loop (https://github.com/Loop3D/dh2loop, last access: 30 September 2021​​​​​​​) is an open-source Python library for extracting and standardizing geologic drill hole data and exporting them into readily importable interval tables (collar, survey, lithology). In this contribution, we extract, process and classify lithological logs from the Geological Survey of Western Australia (GSWA) Mineral Exploration Reports (WAMEX) database in the Yalgoo–Singleton greenstone belt (YSGB) region. The contribution also addresses the subjective nature and variability of the nomenclature of lithological descriptions within and across different drilling campaigns by using thesauri and fuzzy string matching. For this study case, 86 % of the extracted lithology data is successfully matched to lithologies in the thesauri. Since this process can be tedious, we attempted to test the string matching with the comments, which resulted in a matching rate of 16 % (7870 successfully matched records out of 47 823 records). The standardized lithological data are then classified into multi-level groupings that can be used to systematically upscale and downscale drill hole data inputs for multiscale 3D geological modelling. dh2loop formats legacy data bridging the gap between utilization and maximization of legacy drill hole data and drill hole analysis functionalities available in existing Python libraries (lasio, welly, striplog).

The aeromagnetic survey program of the Geological Survey of Canada: contribution to regional geological mapping and mineral exploration

1993 ◽  
Vol 30 (2) ◽  
pp. 243-260 ◽  
Author(s):  
D. J. Teskey ◽  
P. J. Hood ◽  
L. W. Morley ◽  
R. A. Gibb ◽  
P. Sawatzky ◽  
...  
Keyword(s):  
Mineral Exploration ◽  
National Research Council ◽  
High Sensitivity ◽  
Geological Mapping ◽  
Geological Survey ◽  
The Arctic ◽  
Navigation Systems ◽  
Current Standard ◽  
Private Industry ◽  
Aeromagnetic Survey

The aeromagnetic survey operations of the Geological Survey of Canada (GSC) began in 1946, utilizing a magnetometer in a bird system towed by a Royal Canadian Air Force Anson. Subsequent early operations were carried out by the GSC-operated Canso and Aero Commander aircraft. In 1961, the GSC in-house survey team formed the nucleus of a contract surveys group set up to monitor a new program established to complete the aeromagnetic mapping of the Canadian Shield in 12 years on a cost-sharing basis with the provinces. Today, surveys are carried out under contract by light twin-engine aircraft such as the Cessna 404 and even, in some cases, single-engine aircraft that utilize compact computer-controlled data acquisition and navigation systems and inboard magnetometer installations. Early systems were capable of resolution of only a few nanoteslas (nT) compared to the current standard of 0.1 nT or less, and flight path positioning with 35 mm film and photomosaics or topographical maps was extremely challenging. Despite these limitations, the careful selection of survey parameters and attention given to quality control have resulted in a world-class aeromagnetic data base that has contributed significantly to regional geological mapping and to mineral and oil exploration in Canada. Concurrently, the GSC carried out research programs into the development of instrumentation and into processing, interpretation, and enhancement techniques. In 1968, the GSC acquired its own platform, a Beechcraft B80 Queenair, which was used to develop high-sensitivity techniques, and an inboard gradiometer system, which was transferred to private industry in 1983. The GSC, in cooperation with the Flight Research Laboratory of the National Research Council of Canada, has also conducted a program of research into magnetometry and navigation combined with aeromagnetic studies of the Arctic since 1962.

scholarly journals General review of the Survey's activities in 1966

1966 ◽  
Vol 11 ◽  
pp. 3-7
Author(s):  
K Ellitsgaard-Rasmussen
Keyword(s):  
Mineral Exploration ◽  
Geological Mapping ◽  
Geological Survey ◽  
Mineral Deposits ◽  
Economic Interest ◽  
General Review

The Geological Survey of Greenland continued in 1966 to carry out its three main tasks - the geological mapping of Greenland, the investigation of 'mineral deposits of economic interest and the publication of results. In addition the Survey has acted as geological adviser to the Ministry of Greenland in matters concerning the granting of mineral exploration concessions.

A review of Greenland activities, 1997

1998 ◽  
pp. 7-9
Author(s):  
Martin Ghisler
Keyword(s):  
Mineral Exploration ◽  
Field Work ◽  
Geophysical Data ◽  
Geological Survey ◽  
Original Series ◽  
Wide Range ◽  
Scientific Papers ◽  
Offshore Field

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Ghisler, M. (1998). A review of Greenland activities, 1997. Geology of Greenland Survey Bulletin, 180, 7-9. https://doi.org/10.34194/ggub.v180.5078 _______________ This is the second volume of Review of Greenland activities. It follows the tradition of Report of activities of the former Geological Survey of Greenland that was issued for 30 years until 1996.The bulletin contains 24 articles, introduced by the Director's review for 1997, followed by a list of publications on Greenland issued in the Survey's own series and those scientific papers written by its staff published in international outlets. The articles report on onshore and offshore field work and on the main Greenland projects carried out during 1997. Several current research reviews are also included. A wide range of topics is touched on from geological and geophysical data on early Archaean to Quaternary rocks, to offshore geophysics and oceanography, with several papers dealing with petroleum and mineral exploration.

Aeromagnetic gradiometer program of the Geological Survey of Canada

Geophysics ◽  
1989 ◽  
Vol 54 (8) ◽  
pp. 1012-1022 ◽  
Author(s):  
Peter J. Hood ◽  
Dennis J. Teskey
Keyword(s):  
Mineral Exploration ◽  
Geological Survey ◽  
Geologic Mapping ◽  
Aeromagnetic Survey ◽  
R And D ◽  
The Past ◽  
Mapping Tool ◽  
The World ◽  
Computer Scientists ◽  
Color Pixel

During the past two decades, the Geological Survey of Canada Aeromagnetic Survey Group, consisting of geophysicists, electronic engineers, technicians, and computer scientists, developed the aeromagnetic gradiometer technique for mineral exploration. The same group ran the aeromagnetic survey program in Canada, perhaps the largest such continuing aeromagnetic survey program in the world. In 1973, fabrication commenced on an inboard vertical gradiometer system on the GSC Queenair aeromagnetic survey aircraft. During the period 1978–1981, a number of experimental gradiometer surveys were carried out by the Geological Survey of Canada to demonstrate the efficacy of the aeromagnetic gradiometry technique as a geologic mapping tool in mineral exploration programs. Because of a need for aeromagnetic gradiometer surveys in the topographically rugged Gaspé Peninsula of Quebec, the GSC began in 1983 to foster the development of helicopter‐borne gradiometer systems through R and D contracts. Four companies responded and built towed‐boom helicopter gradiometer systems which have now been used in surveys in four eastern provinces. It is clear that the aeromagnetic gradiometer technique combined with VLF EM is an excellent geophysical tool to improve the accuracy of detailed geologic mapping for mineral exploration programs. VLF EM is an inexpensive add‐on that materially improves the geologic mapping capability of the airborne system. The product in color pixel form is in essence a pseudogeologic map and it is presently being employed as such.

scholarly journals General review of the Survey's activities in 1969

1970 ◽  
Vol 28 ◽  
pp. 5-9
Author(s):  
K Ellitsgaard-Rasmussen
Keyword(s):  
Mineral Exploration ◽  
Geological Mapping ◽  
Geological Survey ◽  
Mineral Deposits ◽  
Economic Interest ◽  
General Review

The Geological Survey of Greenland continued in 1969 to carry out its three main tasks - the geological mapping of Greenland, the investigation of mineral deposits of economic interest and the publication of results. In addition the Survey has acted as geological adviser to the Ministry for Greenland in matters concerning the granting of mineral exploration concessions.

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