Electronic Resource
Assessing uncertainty with drill hole spacing studies: applications to mineral resources.
| العنوان: | Assessing uncertainty with drill hole spacing studies: applications to mineral resources. |
|---|---|
| المؤلفون: | Verly G., Orebody modelling and strategic mine planning symposium 2014 Perth, Western Australia 24-Nov-1426-Nov-14, Parker H.M., Postolski T. |
| بيانات النشر: | Carlton, Victoria Australasian Institute of Mining and Metallurgy 2014 |
| نوع الوثيقة: | Electronic Resource |
| مستخلص: | Drill hole spacing studies involving estimation variance calculations are relatively simple and fast to complete and so are useful for risk assessment in simple situations. They can be suitable if time or money is lacking or if the aim is to provide reasonable relative confidence intervals (CIs) of an estimated attribute over medium to long time periods. The proportion of clay-bearing minerals in a porphyry copper deposit is used as an example. Uncertainties which can be accommodated by drill hole spacing simulation include grade, presence of impurities, proportion of clay-bearing materials, grade and tonnages in high-grade zones, and stope limits. These uncertainties can be investigated conceptually for a given production block size and different drill hole spacings. The results (drill hole spacings required to achieve certain CIs) can be used as a guide for classification or as part of the risk assessment of future production. The uncertainties can also be assessed for several successive production increments using the actual drill hole information, with or without additional holes. The process is more accurate when calculating estimation variance directly for large production blocks. Drill hole spacing studies involving estimation variance calculations are relatively simple and fast to complete and so are useful for risk assessment in simple situations. They can be suitable if time or money is lacking or if the aim is to provide reasonable relative confidence intervals (CIs) of an estimated attribute over medium to long time periods. The proportion of clay-bearing minerals in a porphyry copper deposit is used as an example. Uncertainties which can be accommodated by drill hole spacing simulation include grade, presence of impurities, proportion of clay-bearing materials, grade and tonnages in high-grade zones, and stope limits. These uncertainties can be investigated conceptually for a given production block size and different drill hole spacings. The results (drill hole spacings required to achieve certain CIs) can be used as a guide for classification or as part of the risk assessment of future production. The uncertainties can also be assessed for several successive production increments using the actual drill hole information, with or without additional holes. The process is more accurate when calculating estimation variance directly for large production blocks. |
| مصطلحات الفهرس: | BLASTHOLE PATTERNS, CLAY MINERALS, COPPER, DEPOSIT EVALUATION, ECONOMIC GEOLOGY, ERRORS, EXPLORATION DRILLING, GEOSTATISTICS, HIGH GRADE ORE, KRIGING, MODELLING, MULTIVARIATE ANALYSIS, ORE GRADE, ORE RESERVE ESTIMATION, PORPHYRY DEPOSITS, PRODUCTION PLANNING, RISKS, SAMPLING, STATISTICAL ANALYSIS, text |
| URL: | ed. R. Dimitrakopoulos%C% |
| الاتاحة: | Open access content. Open access content |
| ملاحظة: | und |
| Other Numbers: | UKMMM oai:icon.iom3.org:116636 URN:ISBN:978 1 925100 20 4 1309244632 |
| المصدر المساهم: | INSTITUTE OF MATS MINERALS & MINING From OAIster®, provided by the OCLC Cooperative. |
| رقم الانضمام: | edsoai.on1309244632 |
| قاعدة البيانات: | OAIster |
| الوصف غير متاح. |