One of the most serious conundrum facing the stope production in underground metalliferous mining is uneven break （UB： unplanned dilution and ore-loss）. Although the UB has a huge economic fallout to the entire min...One of the most serious conundrum facing the stope production in underground metalliferous mining is uneven break （UB： unplanned dilution and ore-loss）. Although the UB has a huge economic fallout to the entire mining process, it is practically unavoidable due to the complex causing mechanism. In this study, the contribution of ten major UB causative parameters ha,; been scrutinised based on a published UB predicting artificial neuron network （ANN） model to put UB under the engineering management. Two typical ANN sensitivity analysis methods, i.e., connection weight algorithm （CWA） and profile method （PM） have been applied. As a result of CWA and PM applications, adjusted Qrate （AQ） revealed as the most influential parameter to UB with contribution of 22,40% in CWA and 20,48% in PM respectively. The findings of this study can be used as an important reference in stope design, production, and reconciliation stages on underground stoping mine.展开更多
Both women live in Jinshan.It takes them more than one hour to drive to the Expo site,which has attracted tens of thousands of visitors,from home and abroad,since it opened in May.It is not easy for the two women to f...Both women live in Jinshan.It takes them more than one hour to drive to the Expo site,which has attracted tens of thousands of visitors,from home and abroad,since it opened in May.It is not easy for the two women to frequent the area where the grand world exhibition is on display;but both have found a way to be a part of the Expo—by sharing interesting stories and colorful paintings,related to the Expo,with locals,Chinese from other regions and foreign visitors.展开更多
文摘One of the most serious conundrum facing the stope production in underground metalliferous mining is uneven break （UB： unplanned dilution and ore-loss）. Although the UB has a huge economic fallout to the entire mining process, it is practically unavoidable due to the complex causing mechanism. In this study, the contribution of ten major UB causative parameters ha,; been scrutinised based on a published UB predicting artificial neuron network （ANN） model to put UB under the engineering management. Two typical ANN sensitivity analysis methods, i.e., connection weight algorithm （CWA） and profile method （PM） have been applied. As a result of CWA and PM applications, adjusted Qrate （AQ） revealed as the most influential parameter to UB with contribution of 22,40% in CWA and 20,48% in PM respectively. The findings of this study can be used as an important reference in stope design, production, and reconciliation stages on underground stoping mine.
文摘Both women live in Jinshan.It takes them more than one hour to drive to the Expo site,which has attracted tens of thousands of visitors,from home and abroad,since it opened in May.It is not easy for the two women to frequent the area where the grand world exhibition is on display;but both have found a way to be a part of the Expo—by sharing interesting stories and colorful paintings,related to the Expo,with locals,Chinese from other regions and foreign visitors.
