Geophysical method is one method commonly used in the exploration of mineral deposits. This method is considered the indirect method, and is often used in the preliminary exploration stage (reconnaissance), precedes the activities of other intensive exploration. As for the stages of work commonly used in geophysical methods are:
* preliminary survey (determining trajectory)
* measuring points in the target area
* Field Measurement
* Making geophysical maps
* Withdrawal isoanomali lines
* Portrayal profile
* Interpretation anomaly Gravity Method In general,
the gravity method geophysical method that measures the variation of gravity (gravitational) on the earth. This method is rarely used in advanced stages of exploration of ore, but good enough is used to define specific target areas for further surveyed with geophysical methods other more detailed. This variation of the earth's gravitational field caused by the difference in the mass meeting (density) between the rocks. The existence of a source in the form of a mass (massive, lens, or a large loaf) below the surface will cause interference gravity field (relative). This interference is called the gravity anomaly. Because of differences in gravity field is relatively small it is necessary to gauge which has a high enough accuracy. Measure often used is the gravimeter. Gravity measuring instruments on the ground have achieved the accuracy of 0:01 mGal and the sea of 1 mGal. Some deposits such as zinc, bauxite, or barite very difficult to detect by magnetic and electrical methods, but can be detected by gravity methods (gravity), but only to see the profile of rock side (can not directly detect ore) through density anomalies.
* preliminary survey (determining trajectory)
* measuring points in the target area
* Field Measurement
* Making geophysical maps
* Withdrawal isoanomali lines
* Portrayal profile
* Interpretation anomaly Gravity Method In general,
the gravity method geophysical method that measures the variation of gravity (gravitational) on the earth. This method is rarely used in advanced stages of exploration of ore, but good enough is used to define specific target areas for further surveyed with geophysical methods other more detailed. This variation of the earth's gravitational field caused by the difference in the mass meeting (density) between the rocks. The existence of a source in the form of a mass (massive, lens, or a large loaf) below the surface will cause interference gravity field (relative). This interference is called the gravity anomaly. Because of differences in gravity field is relatively small it is necessary to gauge which has a high enough accuracy. Measure often used is the gravimeter. Gravity measuring instruments on the ground have achieved the accuracy of 0:01 mGal and the sea of 1 mGal. Some deposits such as zinc, bauxite, or barite very difficult to detect by magnetic and electrical methods, but can be detected by gravity methods (gravity), but only to see the profile of rock side (can not directly detect ore) through density anomalies.
