Geological investigations for the design of these remedial works included surface stress measurements in the unlined spillway discharge channel as well as geological mapping and diamond core drilling.
22.
Unlike the conventional method of bringing the workpiece to machine, with the help of portable magnetic core drilling machines, you can now bring the machine to the workpiece.
23.
Frank Buschbacher, project director of the Tesoro del Alamo preservation society, said his association can afford the core drilling but has too little money for another meticulous hand-excavation.
24.
Modern geological techniques such as core drilling have identified the site of the vanished sacred "'Lake Lerna, "'which was a freshwater lagoon, separated by barrier dunes from the Aegean.
25.
The core drilling samples, like the salt wedge studies, are another way to provide backup verification, or " ground truth, " as it is called, for the sonar images.
26.
With some core drilling, they found some stone tools, English flint and other " bits and pieces that told us there was a historic site here, " he said.
27.
The physical property of the core progressively improved and below ~ 1, 400 m was of excellent quality . The deep ice core drilling terminated in August 1981.
28.
The company continued to evaluate the geological potential on the Tongo property, as well as on the adjacent Panguma property, with ground geophysical surveys and core drilling of selected targets.
29.
Diamond core drilling ( exploration diamond drilling ) utilizes an annular diamond-impregnated drill bit attached to the end of hollow drill rods to cut a cylindrical core of solid rock.
30.
A representative Ore bulk sample of approximately 65 t was recovered by large diameter ( 200 mm ) diamond core drilling and shipped to Mintek in Johannesburg for metallurgical testwork.
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