A Prospecting Method for Hidden Iron Ore in Steeply Inclined Deep Area

Abstract

The invention discloses a steep-dipping deep concealed iron ore prospecting method. The magnetic parameter quantitative indexes of mine prospecting includes the magnetic anomaly characteristic of the ore-bearing strata distribution range of a concealed BIF (banded iron formation) type iron ore, the magnetic anomaly characteristic of the ore-bearing area of the deep concealed iron deposit, the magnetic anomaly characteristic of the projection of the head of the deep concealed iron deposit on ground, and the magnetic anomaly characteristic of the steep-dipping closed similar fold iron ore body. According to the magnetic anomaly characteristic of the ore-bearing strata distribution range of the concealed BIF (banded iron formation) type iron ore, the total gradient modulus (ASM) of aeromagnetic anomaly under 1:50000 is larger than 50nT / m. According to the magnetic anomaly characteristic of the ore-bearing area of the deep concealed iron deposit, the total gradient modulus (ASM) of aeromagnetic anomaly under 1:50000 is larger than 200nT / m, and deltaT is larger than 300nT. According to the magnetic anomaly characteristic of the projection of the head of the deep concealed iron deposit on ground, the magnetic anomaly deltaT 100-meter-upward-extending vertical second derivative of high-accuracy magnetic measurement under 1:10000 is larger than 275nT. According to the magnetic anomaly characteristic of the steep-dipping closed similar fold iron ore body, magnetic anomaly is zonal, with a length-width ratio being larger than 5: 1, and the profile of the high-accuracy magnetic measurement displays 2 or more peaks, and the anomaly curve of the profile of the high-accuracy magnetic measurement is asymmetric with a depth-width ratio being larger than 1 / 2, and the inclination angel of an axis being larger than 50 degrees. With the method of the invention adopted, the technical problem of the prospecting of the steep-dipping deep concealed iron ore can be solved.

Description

technical field [0001] The invention relates to the technical field of deep ore prospecting in geological exploration, in particular to a method for prospecting for steeply inclined, low-grade iron ore hidden in deep. Background technique [0002] Iron is the most used metal in the world, and its consumption accounts for about 95% of the total metal consumption. Iron and steel products are widely used in various sectors of the national economy and in all aspects of people's lives. They are important pillar products for social development and the most important and most widely used metal materials in modern industries. However, my country's iron ore resources are in short supply, and the supply of iron ore is far from meeting the needs of my country's steel production, and the foreign dependence has been above 50% for many years. On the other hand, there is still great potential for iron ore prospecting in the deep part of my country's main metallogenic belts. However, due t...

AI Technical Summary

Problems solved by technology

However, there is no effective discriminant index for low-grade hidden iron ore deposits that are deeply covered by Neoproterozoic-Paleozoic cap rocks, ore bodies are steeply inclined, and develop closed similar folds

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