Locating abandoned mine shafts using a proton magnetometer


Author : Sahat SadikunPublication : Bulletin of the Geological Society of MalaysiaVolume : 39Page : 15-26Year : 1996


Description

Bulletin of the Geological Society of Malaysia, Volume 39, July 1996, pp. 15 - 26

 

Locating abandoned mine shafts using a proton magnetometer

SAHAT SADIKUN

Program Geologi, Sekolah Sains dan Teknologi, Universiti Malaysia Sabah

 

Abstract: The location of abandoned mine shafts is very important, especially considering increasing urban development in old mining areas. Many old mine shafts are unstable and liable to collapse. The usual methods of finding these shafts, such as coring, are very slow. A study was made using a proton precession magnetometer, of the anomalies associated with some old shafts at Rothley Shield near Newcastle upon Tyne, England. Computer contouring was also carried out to develop the optimum field technique for shaft location using the magnetometer. Several shafts were then successfully located, but further work in an urban environment highlighted difficulties due to noise.

 

Abstrak: Kedudukan syaf lombong terbiar adalah penting, terutamanya memandangkan bertambahnya pembangunan bandar di bekas kawasan perlombongan. Kebanyakan syaf lombong lama adalah tidak stabil dan berkemungkinan untuk runtuh. Kaedah yang biasa digunakan untuk menentukan kewujudan syaf ini seperti menggali, adalah amat perlahan. Satu kajian telah dilakukan menggunakan magnetometer liukan proton dengan anomali bersangkutan dengan syaf lama di Rothley Shield berhampiran Newcastle upon Tyne, England. Pengkonturan komputer juga dijalankan untuk menentukan teknik di lapangan yang optimum untuk menentukan kedudukan syaf menggunakan magnetometer. Beberapa syaf telah berjaya ditemui, tetapi kerja lanjut dilakukan di kawasan persekitaran bandar menemui kesukaran akibat hingar.