Cadmium Uptake and Growth of Three Native California Species Grown in Abandoned Mine Waste Rock

2017 ◽  
Vol 35 (3) ◽  
pp. 210-213 ◽  
Author(s):  
Jeffrey Lauder ◽  
Oriana Chafe ◽  
Jane Godfrey
Keyword(s):  
Mine Waste ◽  
Waste Rock ◽  
Abandoned Mine ◽  
Cadmium Uptake ◽  
Mine Waste Rock

scholarly journals Mapping Potentially Acid Generating Material on Abandoned Mine Lands Using Remotely Piloted Aerial Systems

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 365
Author(s):  
Alison S. Cramer ◽  
Wendy M. Calvin ◽  
Scott W. McCoy ◽  
Ronald J. Breitmeyer ◽  
Marja Haagsma ◽  
...  
Keyword(s):  
Mine Waste ◽  
Waste Rock ◽  
Abandoned Mine ◽  
Mineral Salts ◽  
Rock Pile ◽  
Abandoned Mine Lands ◽  
Waste Rock Pile ◽  
Mine Waste Rock ◽  
Mine Lands ◽  
Aerial Systems

Weathering and transport of potentially acid generating material (PAGM) at abandoned mines can degrade downstream environments and contaminate water resources. Monitoring the thousands of abandoned mine lands (AMLs) for exposed PAGM using field surveys is time intensive. Here, we explore the use of Remotely Piloted Aerial Systems (RPASs) as a complementary remote sensing platform to map the spatial and temporal changes of PAGM across a mine waste rock pile on an AML. We focus on testing the ability of established supervised and unsupervised classification algorithms to map PAGM on imagery with very high spatial resolution, but low spectral sampling. At the Perry Canyon, NV, USA AML, we carried out six flights over a 29-month period, using a RPAS equipped with a 5-band multispectral sensor measuring in the visible to near infrared (400–1000 nm). We built six different 3 cm resolution orthorectified reflectance maps, and our tests using supervised and unsupervised classifications revealed benefits to each approach. Supervised classification schemes allowed accurate mapping of classes that lacked published spectral libraries, such as acid mine drainage (AMD) and efflorescent mineral salts (EMS). The unsupervised method produced similar maps of PAGM, as compared to supervised schemes, but with little user input. Our classified multi-temporal maps, validated with multiple field and lab-based methods, revealed persistent and slowly growing ‘hotspots’ of jarosite on the mine waste rock pile, whereas EMS exhibit more rapid fluctuations in extent. The mapping methods we detail for a RPAS carrying a broadband multispectral sensor can be applied extensively to AMLs. Our methods show promise to increase the spatial and temporal coverage of accurate maps critical for environmental monitoring and reclamation efforts over AMLs.

scholarly journals Revaluing mine waste rock for carbon capture and storage

2010 ◽  
Vol 24 (1) ◽  
pp. 64-79 ◽  
Author(s):  
Michael Hitch ◽  
Sheila M. Ballantyne ◽  
Sarah R. Hindle
Keyword(s):  
Carbon Capture ◽  
Mine Waste ◽  
Carbon Capture And Storage ◽  
Waste Rock ◽  
Mine Waste Rock ◽  
And Storage

Combined DC resistivity and induced polarization (DC-IP) for mapping the internal composition of a mine waste rock pile in Nova Scotia, Canada

2018 ◽  
Vol 150 ◽  
pp. 40-51 ◽  
Author(s):  
Christopher Power ◽  
Panagiotis Tsourlos ◽  
Murugan Ramasamy ◽  
Aristeidis Nivorlis ◽  
Martin Mkandawire
Keyword(s):  
Nova Scotia ◽  
Mine Waste ◽  
Induced Polarization ◽  
Waste Rock ◽  
Dc Resistivity ◽  
Rock Pile ◽  
Waste Rock Pile ◽  
Mine Waste Rock

scholarly journals Platinum Mine Workers’ Exposure to Dust Particles Emitted at Mine Waste Rock Crusher Plants in Limpopo, South Africa

2020 ◽  
Vol 17 (2) ◽  
pp. 655
Author(s):  
Maasago M. Sepadi ◽  
Martha Chadyiwa ◽  
Vusumuzi Nkosi
Keyword(s):  
South Africa ◽  
Mine Waste ◽  
Waste Rock ◽  
Dust Exposure ◽  
Dust Particles ◽  
Hazardous Substance ◽  
Significant Difference ◽  
Mine Waste Rock ◽  
Rock Crusher ◽  
Mine Workers

The South African mining industry is one of the largest producers of platinum (Pt) in the world. Workers in this industry are exposed to significant amounts of dust, and this dust consists of particles sizes that can penetrate deep inside the respiratory region. A cross-sectional study was conducted to evaluate dust exposure risk at two Pt mine waste rock crusher plants (Facility A and B) in Limpopo, South Africa. Workers’ demographic and occupational information was collected through a structured questionnaire, a walk-through observation on facilities’ processes, and static dust sampling for the collection of inhalable and respirable dust particles using the National Institute for Occupational Safety and Health (NIOH) 7602 and the Methods for Determination of Hazardous Substance (MDHS) 14/4 as guidelines. Only 79% of Pt mine workers, used their respiratory protective equipment (RPE), sixty-five percent were exposed to work shifts exceeding the recommended eight hours and 8.8% had been employed for more than ten years. The mean time-weighted average (TWA) dust concentrations between Facility A and B showed a significant difference (p < 0.026). The Pt mine’s inhalable concentrations (range 0.03–2.2 mg/m3) were higher than the respirable concentrations (range 0.02–0.7 mg/m3), however were all below the respective international and local occupational exposure limits (OELs). The Pt mine’s respirable crystalline silica (SiO2) quartz levels were all found below the detectable limit (<0.01 mg/m3). The Pt miners had increased health risks due to accumulated low levels of dust exposure and lack of usage of RPE. It is recommended that an improved dust control program be put in place which includes, but is not limited to, stockpile enclosures, tire stops with water sprays, and education on the importance of RPE usage.

An Experimental Study on the Mechanical Properties of Cemented Rock-Tailings Fill

2014 ◽  
Vol 941-944 ◽  
pp. 2611-2619
Author(s):  
Li Jie Guo ◽  
Ke Ping Zhou ◽  
Xiao Cong Yang ◽  
Guang Sheng Liu ◽  
Wen Yuan Xu
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Mine Waste ◽  
Waste Rock ◽  
Mill Tailings ◽  
Mix Proportion ◽  
Study Results ◽  
Mine Waste Rock ◽  
Materials Used ◽  
Mine Development

This paper outlines an effective approach to making composite backfill using mine waste material. Composite materials are widely used in many areas of engineering because of their unique structural properties. Cemented rock-tailings are one of the most prevalent materials used for composite backfill because they can effectively make use of mine waste rock and mill tailings that would otherwise be simply considered waste. This backfill method has the capability of maintaining the mine environment while still allowing for continued mine development. An experimental study is being conducted in a cooperative mine research project to investigate the properties of backfill material and specifically the mechanical characteristics of cemented waste rock-tailings fill. This study details the characteristics of the composite backfill aggregate with respect to the compressive strength of the cemented rock-tailings fill and the backfill mix-proportion, as well as outlines a new method of study for cemented rock-tailings fill mechanics. The study results show the compressive strength of cemented rock-tailings fill is dependent mainly on the cement and waste rock content. Ensuring a precise backfill mix proportion can effectively reduce the cement dosage, thereby decreasing the backfill cost realized for the mine.

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