MAGNETIC PROSPECTING FOR IRON ORES IN JAMAICA

Two ground magnetometer surveys over iron ore deposits in Jamaica are described and the results of the observations interpreted. An improvised but economical technique is used to measure the main magnetic properties of ore samples obtained from surface exposures, and a suitable statistical analysis is applied to determine the significance of these observations. The interpretation of the magnetic profiles, carried out on the basis of these observations, is complicated by the non‐uniformity of the natural remanent magnetization of the ores and the roughness of Jamaican topography. The ambiguities due to the latter factor are diminished by taking into account in the computations the changes in the elevation of the ground surface. The results of the interpretation are on the whole successful and give the approximate sizes and positions of the main ore bodies. A conclusion is reached that, in the case of small‐scale near‐surface deposits whose approximate position is already known, ground magnetometer surveys can be superior to those made from the air because of their smaller cost and greater power of resolution in rough terrain.

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Development of resource-saving technology when mining ore bodies by blocks under rock pressure

E3S Web of Conferences ◽

10.1051/e3sconf/202016602006 ◽

2020 ◽

Vol 166 ◽

pp. 02006 ◽

Cited By ~ 3

Author(s):

Serhii Pysmenniy ◽

Natalya Shvager ◽

Oleksandr Shepel ◽

Kostiantyn Kovbyk ◽

Oleksandr Dolgikh

Keyword(s):

Rock Pressure ◽

Iron Ore ◽

Ore Deposits ◽

Borehole Diameter ◽

Resource Saving ◽

Ore Bodies ◽

Iron Ore Deposits ◽

Degree Of Extraction

The article aims to develop the resource-saving technology when mining steep ore bodies applying 250 mm-diameter boreholes to break ore into the compressed environment. This will reduce dilution of the mined ore mass in conditions of rock pressure around blocks. When mining iron ore deposits of Kryvyi Rih basin, applied mining systems allow for creation of the compensatory space as the first stage. However, these stopes fail under rock pressure, this influencing negatively ore breaking and extraction. The degree of extraction can be increased through breaking ore mass into the compressed environment. The width of the ore layer to be broken onto the compressed environment is determined through industrial investigations. To enhance breaking conditions, it is suggested to apply boreholes of a larger diameter. However, there is no technique developed for determining thickness of the ore layer to be broken depending on the borehole diameter and the fragmentation factor. When applying 250 mm boreholes, increase of thickness of the layer to be broken from 2 to 10 m is found to cause compaction of the previously broken layer up to 3 m with the optimal ore fragmentation factor of 1.3–1.5 and 3-fold decrease of lumps yield. This results from the fact that drilling a 250 mm borehole to secure even provision of the massif with explosives reduces the line of the least resistance.

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USE OF LASER SCANNING TECHNOLOGIES FOR OBSERVATIONS OF DEFORMATIONS OF OPEN PIT WALLS

Interexpo GEO-Siberia ◽

10.33764/2618-981x-2020-1-1-152-160 ◽

2020 ◽

Vol 1 (1) ◽

pp. 152-160

Author(s):

Olga G. Besimbayeva ◽

Farit K. Nizametdinov ◽

Elena A. Oleynikova

Keyword(s):

Laser Scanning ◽

Iron Ore ◽

Ore Deposits ◽

Open Pit ◽

Scanning System ◽

Near Surface ◽

Mountain Ranges ◽

Measurement Results ◽

Iron Ore Deposits ◽

The Stability

The article discusses the use of laser scanning technology for observing the deformations of an open pit walls in iron ore deposits. To carry out observations and analysis of the results obtained, an iron ore quarry was selected. The task of the study is to summarize methods and technical means used at mining enterprises for observing and measuring deformations in mountain ranges. The safety and efficiency of iron ore quarries is largely determined by the methods used to monitor the deformation process and calculate the stability of the pit walls and dumps. Based on the analysis of existing approaches to solving this problem, a conclusion was drawn on the advisability of using a laser scanning system for assessing sustainability. As a result, an analysis of the measurement results obtained in a digital model of the quarry near-surface arrays was obtained, which allows creating an electronic database for further use in surveying and geomechanical tasks.

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PRACTICE OF USE OF LASER SCANNING TECHNOLOGIES FOR OBSERVATIONS OF DEFORMATIONS OF WALLS

Interexpo GEO-Siberia ◽

10.33764/2618-981x-2019-1-1-272-278 ◽

2019 ◽

Vol 1 (1) ◽

pp. 272-278

Author(s):

Farit Nizametdinov ◽

Elena Oleynikova ◽

Alexey Nagibin

Keyword(s):

Laser Scanning ◽

Iron Ore ◽

Ore Deposits ◽

Scanning System ◽

Electronic Database ◽

Near Surface ◽

Measurement Results ◽

Iron Ore Deposits ◽

The Stability ◽

Laser Scanning System

The article discusses the use of laser scanning technology for observing the deformations of pit walls in iron ore deposits. To carry out observations and analysis of the results obtained, an iron ore quarry in the Akmola region was selected. The task of the study is to summarize the methods and technical means used at mining enterprises for observing and measuring deformations in moun-tain ranges. The safety and efficiency of iron ore quarries is largely determined by the methods used to monitor the deformation process and calculate the stability of the pit walls and dumps. Based on the analysis of existing approaches to solving this problem, a conclusion was drawn on the advisabil-ity of using a laser scanning system for assessing sustainability. As a result of the analysis of the ob-tained measurement results, a digital model of the quarry near-surface arrays was obtained, which allows you to create an electronic database for further use in surveying and geomechanical tasks.

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