Ore grade estimation is one of the most difficult problems when mining offshore deposits. In this research, a platinum deposit near Goodnews Bay, South-West of Alaska, was estimated with emerging techniques such as conditional simulation and support vector machines (SVM). Results of the estimation are presented and compared with a traditional estimation technique, such as the Inverse Distance Squared method. The area was divided in three clusters, based on the K-means method and geographical features. Also, Genetic Algorithm was used for appropriate data division. SVM parameters were optimized prior to the ore grade calculations. All estimations produced similar results for various cut-off grades, being the highest tonnages of platinum between 400 and 200 mg/m3. Reliability for conditional simulation was measured selecting blocks over 90% of probability for each cut-off value. SVM performance was evaluated using the Mean Square Error (MSE), the Mean Absolute Error (MAE) and the Correlation Coefficient Squared (R2). Using Pearson's correlation coefficient, SVM results presented a confidence of 95% in cluster 01, and 99% in clusters 02 and 03. Support vector machines seem to be an adequate tool for ore grade prediction, and it has a potential for its use in more complex geological and mining problems.
Thesis (M.S.) University of Alaska Fairbanks, 2006
The export option will allow you to export the current search results of the entered query to a file. Different
formats are available for download. To export the items, click on the button corresponding with the preferred download format.
By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.
To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export.
The amount of items that can be exported at once is similarly restricted as the full export.
After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.