scholarly journals Application of Geochemical Technique in Exploration and Evaluation of Copper, Lead and Zinc Resources of Nepal

1993 ◽  
Vol 9 ◽  
Author(s):  
B. M. Jnawali ◽  
K. M. Amatya
Keyword(s):  
Base Metal ◽  
Host Rock ◽  
Mineral Exploration ◽  
Soil Sampling ◽  
Reliable Estimate ◽  
Soil Geochemistry ◽  
Potential Host ◽  
Lead And Zinc ◽  
Copper Lead

Application of Geochemical technique in mineral exploration was used in Nepal during 1975-1985 by the Mineral Exploration Development Board (MEDR). Systematic drainage reconnaissance over 40,000 km2 area resulted in the recognition of a large number of anomalies several of which are related to previously unknown mineralizations. The anomalies were categorized  into  1  to 4   assessed  on  the  basis  of  magnitude,  homogeneity,  area and potential host rock. All anomalies of category 1 and 2 that were investigated by follow-up stream sediment and soil geochemistry of varying stages were finally found to disclose the mineralized sources. In all cases, detailed grid soil sampling results in conjunction with geologic observations enabled to ascertain the location, extent and continuity of sub­ outcropping bedrock source with considerable precision, but it was not possible to make reliable estimate of grade. It has been attempted to evaluate the base metal resource based on the data available of the MEDR work as well as Department of Mines and Geology (DMG) and others. Although no economic deposits have been discovered except Ganesh Himal Zinc Lead, about 20 base metal prospects have been drilled and tonnage and grade proved and estimated. Of these, Kalitar Copper and Wapsa Copper deposits are considered to be of marginal economic grade, while the rest are inventoried a deposits of subeconomic to non-economic grade.

scholarly journals Follow-up on Ujarassiorit mineral hunt finds and outreach activities, South-East Greenland

1969 ◽  
pp. 53-56
Author(s):  
Majken D. Poulsen ◽  
Holger Paulick ◽  
Diogo Rosa ◽  
Vincent J. Van Hinsberg ◽  
Jonas Petersen ◽  
...  
Keyword(s):  
Base Metal ◽  
Precious Metal ◽  
Mineral Exploration ◽  
Mineral Resources ◽  
Original Sample ◽  
East Greenland ◽  
Rock Samples ◽  
Geological Context

In connection with fi eld work in South-East Greenland in 2014, we took the opportunity to examine the geology associated with potentially valuable mineral occurrences found by local rock collectors. Th e initial fi nds were made by local collectors as part of Ujarassiorit, which is an annual mineral hunt competition where anyone in Greenland can submit samples of rocks they have found i n the countryside for closer examination by the Ministry of Mineral Resources (see www.ujarassiorit.gl). In the Tasiilaq region, Ujarassiorit resulted in fi nds of corundum, precious metal and base-metal mineral occurrences. Our intention was to locate the original sample sites with help from the local rock collectors, describe the geological context and assess the potential for mineral exploration. Further work will include laboratory analyses of rock samples and geological reporting.

Base metal enrichment in volcanic sublimates and secondary alteration products from Vesuvius and Vulcano

1976 ◽  
Vol 40 (313) ◽  
pp. 481-486 ◽  
Author(s):  
J. G. Angus ◽  
G. R. Davis
Keyword(s):  
Base Metal ◽  
Vapour Phase ◽  
Major Elements ◽  
Metal Enrichment ◽  
Secondary Alteration ◽  
Lead And Zinc ◽  
Wide Range ◽  
Vapour Phase Transport ◽  
Phase Transport ◽  
Copper Lead

SummaryA wide range of volcanic sublimates and alteration products from the Johnston-Lavis collection has been analysed for major elements plus copper, lead, and zinc. 'Aphthitalite' and 'natrikalite' from Mount Vesuvius and an 'alum' from the island of Vulcano all proved to be enriched in copper and selected analyses are tabulated. The process leading to copper and lead enrichment of the Vesuvian material may be vapour phase transport as chloride followed by sulphation on sublimation. It is suggested that the source of the copper found in the alum sample from Vulcano could be of interest to economic geologists.

On: “Effect of tropical weathering on electrical and electromagnetic measurements” by G. J. Palacky and K. Kadekaru (GEOPHYSICS, January 1979, p. 69–88).

Geophysics ◽  
1980 ◽  
Vol 45 (7) ◽  
pp. 1205-1208
Author(s):  
B. B. Bhattacharya ◽  
P. K. Hazra
Keyword(s):  
Host Rock ◽  
Vertical Electrical Soundings ◽  
Electromagnetic Measurements ◽  
Tropical Weathering ◽  
Electrical Soundings

In this paper, the authors showed a series of electromagnetic (EM) profiles (Figure 20, p. 86) obtained from the ground follow‐up using a slingram system with a frequency of 1600 Hz and coil separation of 120 m. Measurements along all the profiles (A to E) show considerable in‐phase and quadrature anomaly. The host rock in this case is amphibolite. The vertical electrical soundings over the amphibolite (Figure 16, p. 82) indicate that the weathered amphibolite has mean thickness and resistivity of 8.5 ± 2.1 m and 29.7 ± 6.5 Ω-m, respectively. It would, therefore, be reasonable to assume that the in‐phase and quadrature anomalies have been influenced due to the presence of conducting overburden, and the response of the target in such a situation can be altogether different compared to the anomaly of the target in the presence of an insulating or highly resistive overburden.

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