Study and Application of Asymmetrical Disk Tools for Hard Rock Mining

In this article, the method of hard rock mining by undercutting or back incision using asymmetrical disk tools as an alternative to the milling method with the use of cutting tools was described. The results of modelling the penetration of a single asymmetric disk tool edge into an artificial and natural rock sample were presented and compared with empirical laboratory tests. The effect of stand tests for mining artificial rock samples using asymmetrical disk tools mounted on the rotating plate was presented. The tests were carried out on two unique test stands. The solution of an innovative mining head with a complex motion trajectory, using the asymmetrical disk tools, was presented. The innovative mining head especially developed at the AGH Kraków Department of Machinery Engineering and Transport for roadheaders, was presented. The results of preliminary field tests with the use of this mining head were also described.

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Influence of Constructional and Kinematic Parameters of the New Solution of Roadheader Mining Head on the Effectiveness of its Work

Multidisciplinary Aspects of Production Engineering ◽

10.2478/mape-2018-0014 ◽

2018 ◽

Vol 1 (1) ◽

pp. 101-107

Author(s):

Krzysztof Kotwica ◽

Paweł Sienkiewicz

Keyword(s):

Grain Size ◽

Tool Wear ◽

Hard Rock ◽

Field Tests ◽

Kinematic Parameters ◽

Material Parameters ◽

Disk Tool ◽

Hard Rock Mining ◽

Rock Mining ◽

Complex Trajectory

Abstract The paper presents a new solution of a mining head for roadheader designed for hard and very hard rock mining. The mining head was equipped with mini disk tools with a complex trajectory. The results of field tests were presented, under which the effectiveness of the new mining head solution was observed. The load and vibrations of the mining head, dustiness and grain size of the excavated material as well as disk tool wear were measured. These tests were carried out for various constructional and material parameters of the used asymmetrical mini disk tools and kinematic parameters of the mining head.

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Hard Rock Mining with the Use of New Cutting Tools

Journal of Mining Science ◽

10.1023/b:jomi.0000023191.07433.a5 ◽

2003 ◽

Vol 39 (4) ◽

pp. 387-393 ◽

Cited By ~ 1

Author(s):

K. Kotwica ◽

P. Gospodarczyk

Keyword(s):

Hard Rock ◽

Cutting Tools ◽

Hard Rock Mining ◽

Rock Mining

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Asymmetrical mini disk tools – possibilities of use and directions for further development

New Trends in Production Engineering ◽

10.2478/ntpe-2019-0023 ◽

2019 ◽

Vol 2 (1) ◽

pp. 223-232

Author(s):

Krzysztof Kotwica

Keyword(s):

Laboratory Tests ◽

Hard Rock ◽

Field Tests ◽

Hard Rock Mining ◽

Rock Mining ◽

Complex Trajectory ◽

Further Development

Abstract The paper presents a new solution of asymmetrical mini disk tools for mining head of roadheader designed for hard and very hard rock mining. In the first part the benefits of disk tools used in TBM's and special tunneling machines were presented. Next part presents the results of works and laboratory tests performed for developing of new solution of asymmetrical mini disk tools. On the basis of these results new mining head equipped with mini disk tools with a complex trajectory was designed. The results of field tests with different constructional and material solutions of asymmetrical mini disk tools were presented. The directions for further development were described.

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Quantification of Elemental Contaminants in Unregulated Water across Western Navajo Nation

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph16152727 ◽

2019 ◽

Vol 16 (15) ◽

pp. 2727 ◽

Cited By ~ 7

Author(s):

Jonathan Credo ◽

Jaclyn Torkelson ◽

Tommy Rock ◽

Jani C. Ingram

Keyword(s):

Native American ◽

New Mexico ◽

Hard Rock ◽

Water Systems ◽

American Southwest ◽

Western United States ◽

Navajo Nation ◽

Hard Rock Mining ◽

Rock Mining ◽

American Nation

The geologic profile of the western United States lends itself to naturally elevated levels of arsenic and uranium in groundwater and can be exacerbated by mining enterprises. The Navajo Nation, located in the American Southwest, is the largest contiguous Native American Nation and has over a 100-year legacy of hard rock mining. This study has two objectives, quantify the arsenic and uranium concentrations in water systems in the Arizona and Utah side of the Navajo Nation compared to the New Mexico side and to determine if there are other elements of concern. Between 2014 and 2017, 294 water samples were collected across the Arizona and Utah side of the Navajo Nation and analyzed for 21 elements. Of these, 14 elements had at least one instance of a concentration greater than a national regulatory limit, and six of these (V, Ca, As, Mn, Li, and U) had the highest incidence of exceedances and were of concern to various communities on the Navajo Nation. Our findings are similar to other studies conducted in Arizona and on the Navajo Nation and demonstrate that other elements may be a concern for public health beyond arsenic and uranium.

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