Role of secondary minerals in the acid generating potential of weathered mine tailings: crystal-chemistry characterization and closed mine site management involvement

2021 ◽  
pp. 147105
Author(s):  
Abdellatif Elghali ◽  
Mostafa Benzaazoua ◽  
Hassan Bouzahzah ◽  
Mustapha Abdelmoula ◽  
James J. Dynes ◽  
...  
Keyword(s):  
Crystal Chemistry ◽  
Mine Tailings ◽  
Site Management ◽  
Secondary Minerals ◽  
Mine Site ◽  
Management Involvement

Management's Contribution to Internet Commerce Benefit - Experiences of Online Small Businesses

2011 ◽  
pp. 277-296 ◽  
Author(s):  
Simpson Poon
Keyword(s):  
Small Businesses ◽  
Small Firms ◽  
Management Support ◽  
Internet Commerce ◽  
Is Success ◽  
Depth Study ◽  
Specialist Knowledge ◽  
It Success ◽  
Management Involvement

The importance of management and Information Technology (IT) success had been repeatedly identified in small business IT studies (for example, DeLone, 1988). When measuring information satisfaction among small firms, top management involvement was found to be one of the most important factors (Montazemi, 1988). The quest for the role of management involvement in Information Systems (IS) success in small firms continued into the 1990s. For example, Yap, Soh, and Raman (1992) studied a group of Singaporean small firms using earlier findings and discovered that CEO involvement was positively related to IS success. CEO involvement such as attending project meetings, involvement in information requirement needs analysis, reviewing consultants’ recommendations and project monitoring are important to IS success. Thong, Yap and Raman (1996) pointed out that although management support was important, in cases where internal IS expertise was lacking, specialist knowledge (for example, engaging IT consultants in projects) was important to success. An in-depth study on motivators and inhibitors for small firms to adopt computing identified managerial enthusiasm as a key motivator (Cragg, 1998). The overseeing role of management during system implementation was found to be important to success. Management support was also found to be an important factor for IT success in the case of personal computing acceptance (Igbaria, Zinatelli, Craig, & Cavaye, 1997). All of these studies suggested that management involvement was critical to IS success regardless of cultural background.

The role of crystal chemistry in YbCu5−xAux

2015 ◽  
Vol 627 ◽  
pp. 20-24 ◽  
Author(s):  
M. Giovannini ◽  
I. Čurlík ◽  
F. Gastaldo ◽  
M. Reiffers ◽  
J.G. Sereni
Keyword(s):  
Crystal Chemistry

Solubility of the nadorite group minerals: implications for mobility of Sb and Bi in oxidised settings

2017 ◽  
Vol 14 (4) ◽  
pp. 224
Author(s):  
Adam J. Roper ◽  
Peter Leverett ◽  
Timothy D. Murphy ◽  
Peter A. Williams
Keyword(s):  
Redox Potential ◽  
Significant Role ◽  
Stability Studies ◽  
Secondary Minerals ◽  
Relative Stabilities ◽  
Mineral Phases ◽  
Minor Part ◽  
A Minor

Environmental contextThe dispersion of antimony in the environment has been misunderstood over the last few decades. Investigating the solubility of naturally forming mineral phases such as nadorite resulted in determination of its limited role in Sb dispersion, providing evidence that nadorite can only limit antimony dispersion in mildly oxidising conditions. Nadorite can only play a significant role in Sb immobilisation in a particular redox window, which forms only a minor part of the framework of Sb dispersion. AbstractAs part of a study of the control that secondary minerals exert on the dispersion of antimony and bismuth in the supergene environment, syntheses and stability studies of nadorite (PbSbO2Cl) and perite (PbBiO2Cl) have been undertaken. Solubilities in aqueous HNO3 were determined at 298.2K and the data obtained used to calculate values of ΔGfθ(298.2K). The ΔGfθ(s, 298.2K) values for PbSbO2Cl (–622.0±2.8kJmol–1) and PbBiO2Cl (–590.0±1.3kJmol–1) have been used in subsequent calculations to determine relative stabilities and relationships with other common secondary Sb and Bi minerals. While the role of nadorite in immobilising Sb is dependent upon the prevailing redox potential such that SbIII is stable, perite may be a significant phase in limiting the dispersion of Bi in certain supergene settings.

The role of PV in demand-site management: Policy and industry challenges

1992 ◽  
Author(s):  
John Byrne ◽  
Constantine Hadjilambrinos ◽  
Young-Doo Wang
Keyword(s):  
Management Policy ◽  
Site Management

scholarly journals Pyrite oxidization accelerates bacterial carbon sequestration in copper mine tailings Type of contribution

2018 ◽  
Author(s):  
Yang Li ◽  
Zhaojun Wu ◽  
Xingchen Dong ◽  
Zifu Xu ◽  
Zhongjun Jia ◽  
...  
Keyword(s):  
Carbon Sequestration ◽  
Mine Tailings ◽  
Copy Number ◽  
Isotope Labeling ◽  
Gene Copy Number ◽  
Stable Isotope Probing ◽  
Gene Copy ◽  
Cbbl Gene ◽  
Heavy Fractions

Abstract. Polymetallic mine tailings have great potential as carbon sequestration tools to stabilize atmospheric CO2 concentrations. However, previous studies focused on carbonate mineral precipitation, while the role of autotrophs in carbon sequestration by mine tailings has been neglected. In this study, carbon sequestration in two mine tailings treated with FeS2 and 13C-labeled CO2 was analyzed using 13C isotope labeling, pyrosequencing and DNA-based stable isotope probing (SIP) to identify carbon fixers. Mine tailings treated with FeS2 exhibited a higher percentage of 13C atoms (1.76 ± 0.06 in Yangshanchong and 1.36 ± 0.01 in Shuimuchong) than the control groups over a 14-day incubation, as well an increase in the total organic carbon (TOC) content (0.20 ± 0.11 mg/g in Yangshanchong and 0.28 ± 0.14 mg/g in Shuimuchong). These data demonstrated the role of autotrophs in carbon sequestration with pyrite addition. Pyrite treatment led to changes in the composition of bacterial communities, and the genera Sulfobacillus (8.04 %) and Novosphingobium (8.60 %) were found to be dominant in these communities. In addition, the DNA-SIP results indicated that the cbbL gene copy number was 8.20–16.50 times greater than the cbbL gene copy number in 13C-labeled heavy fractions. Furthermore, a Sulfobacillus-like cbbL gene sequence (cbbL-OTU1) accounted for 30.11–34.74 % of all cbbL gene sequences in the 13C-labeled heavy fractions of mine tailings treated with FeS2. These findings highlight the importance of the RubisCO form I-encoding gene, cbbL, in bacterial carbon sequestration and demonstrate the ability of chemoautotrophs to sequester carbon during sulfide mineral oxidation in mine tailings. This study is the first to investigate carbon sequestration by autotrophic groups in mine tailings through the use of isotope tracers and DNA-SIP.

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