A Chart for Judging Optimal Sample Spacing for Ore Grade Estimation: Part II

Drumond, David Alvarenga; Amarante, Flavio Azevedo Neves; Koppe, Vanessa Cerqueira; Costa, João Felipe Coimbra Leite

doi:10.1007/s11053-019-09481-w

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…Then, the rock samples are tested to analyze the mineral content in the rock. The mineral content determines the type of underground space occupied by the ore body 51 . However, the original samples obtained during exploration are not completely continuous.…”

Section: Methodsmentioning

confidence: 99%

A new method for estimating ore grade based on sample length weighting

Liu

Deng

Tian

et al. 2023

Sci Rep

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Estimation of ore grade is very important for the value evaluation of ore deposits, and it directly affects the development of mineral resources. To improve the accuracy of the inverse distance weighting (IDW) method in ore grade estimation and reduce the smoothing effect of the IDW method in grade estimation, the weight calculation method involved in the IDW method was improved. The length parameter of the ore sample was used to calculate the weight of the IDW method. The length of the ore samples was used as a new factor of the weighting calculation. A new method of IDW integrated with sample length weighting (IDWW) was proposed. The grade estimation of Li, Al, and Fe in porcelain clay ore was used as a case study. A comparative protocol for grade estimation via the IDWW method was designed and implemented. The number of samples involved in the estimation, sample combination, sample grade distribution, and other factors affecting the grade estimation were considered in the experimental scheme. The grade estimation results of the IDWW and the IDW methods were used for comparative analysis of grades of the original and combined samples. The estimated results of the IDWW method were also compared with those of the IDW method. The deviation analysis of the estimated grade mainly included the minimum, maximum, mean, and coefficient of variation of the ore grade. The estimation effect of IDWW method was verified. The minimum deviations of the estimated grade of Li, Al, and Fe were between 9.129% and 59.554%. The maximum deviations were between 4.210 and 22.375%. The mean deviations were between − 1.068 and 7.187%. The deviations in the coefficient of variation were between 3.076 and 36.186%. The deviations in the maximum, minimum, mean, and coefficients of variation of the IDWW were consistent with those of the IDW, demonstrating the accuracy and stability of the IDWW method. The more the samples involved in the estimation, the greater the estimation deviations of IDW and IDWW methods. The estimated deviations of Li, Al, and Fe were affected by the shape of the grade distribution, when the same estimation parameters were used. The grade distribution pattern of the samples significantly influenced the grade estimation results. The IDWW method offers significant theoretical advantages and addresses the adverse effects of uneven sample lengths on the estimates. The IDWW method can effectively reduce the smoothing effect and improves the utilization efficiency of the original samples.

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Section: Methodsmentioning

confidence: 99%

A new method for estimating ore grade based on sample length weighting

Liu

Deng

Tian

et al. 2023

Sci Rep

View full text Add to dashboard Cite

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Grade control drillhole spacing and mining selectivity determination using high resolution simulations applied on distinctly heterogeneous open pit mines

Faraj

2024

Mining Technology: Transactions of the Institutions of Mining a

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The grade control drillhole spacing and mining selectivity decisions are typically made using the resource model estimated from exploration and infill drilling data. Once production starts, large quantities of grade control data are collected to delineate ore and waste boundaries for ore control. In this work, a grade control drillhole spacing and mining selectivity optimization workflow is presented which allows the practitioner to use site specific knowledge to determine the most profitable ore control mining scenario. The densely gridded production data is used to simulate a ground truth block model from which scenarios of variable drillhole spacing and selectivity are evaluated against their corresponding costs to determine the maximum profit scenario. Eleven mining scenarios are evaluated using year production data from three distinctly heterogeneous mine with drillhole spacing and mining selectivity varying from 3 × 3 × 3 m (27 m3) to 30 × 30 × 15 m (13,500 m3). The profit differences from the optimum scenario varied by millions of dollars (1–8%) against the next best case depending on the heterogeneity of the deposit. Practitioners could apply this workflow to inform grade control drillhole spacing and mining selectivity decisions for different domains within the mine or multiple pits especially if distinctly heterogeneous volumes exist.

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Maden Kaynak Belirleme Sondaj Programlarının Optimizasyonu

Özkan

2024

Jeoloji Mühendisliği Dergisi

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Kaynak belirleme sondaj programları, maden yataklarının sınırlarını ve işletilebilirliğini belirlemek için yapılan bir örnekleme sürecidir. Bu süreçte, sistematik ve tesadüfi olmak üzere iki tür örnekleme hatası bulunur. Sistematik hatalar, cihaz kalibrasyon hataları veya örneklerin yatağı yetersiz temsil etmesi gibi durumlarda ortaya çıkar ve tahminlerin doğruluğunu olumsuz etkiler. Tesadüfi hatalar ise örneklerin rastgele dağılımı veya doğal değişkenlikten kaynaklanır ve tahminlerde belirsizliğe neden olur. Bu hataların etkisi, daha fazla örnekleme yaparak azaltılabilir, ancak sondaj maliyetli bir işlem olduğu için kabul edilebilir belirsizlik düzeyine ulaşmak adına maliyet ve belirsizlik arasında bir denge kurulması zorunludur. Kaynak belirleme sondajlarının optimizasyonu, bu dengeyi sağlayacak şekilde sondaj noktalarının yerleşimini veya sondaj aralıklarını belirlemeye dayanır. Geometrik yaklaşım, sondaj etki alanlarının örtüşmesini en aza indirerek optimizasyon yaparken, jeoistatistik yöntemler kriging varyansı gibi ölçütlere göre belirsizliği kabul edilebilir seviyelere düşürmeye çalışır. Bilginin değeri yaklaşımı, elde edilen bilgiden ekonomik olarak en yüksek faydayı sağlarken, yanlış sınıflandırma maliyetlerini minimize etmek, ekonomik kayıpları önlemeyi hedefler. Genetik algoritmalar ve parçacık sürü optimizasyonu gibi meta-sezgisel yöntemler de belirsizlik yönetiminde etkilidir, ancak yüksek hesaplama gücü gerektirdiğinden sınırlı uygulanmaktadır. Bu optimizasyon yöntemleri, maliyetleri düşürerek ve kaynak modelinin doğruluğunu artırarak önemli katkılar sağlar.

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A Chart for Judging Optimal Sample Spacing for Ore Grade Estimation: Part II

Cited by 3 publications

References 5 publications

A new method for estimating ore grade based on sample length weighting

A new method for estimating ore grade based on sample length weighting

Grade control drillhole spacing and mining selectivity determination using high resolution simulations applied on distinctly heterogeneous open pit mines

Maden Kaynak Belirleme Sondaj Programlarının Optimizasyonu

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