Statistical Methods For Mineral Engineers Fix Online

“For the last six hours,” she said, pointing to a string of seven points all below the centerline, “we have been running fine. But this run of seven points all below the mean? That’s a Nelson Rule violation. It’s not out of control statistically, but the probability of this happening by chance is less than 1%. It’s a trend. The mill is grinding finer because the new media supplier’s ball hardness is different. We need to back off the feed rate now—not in two hours.”

When predicting whether a concentrate will be "on-spec" (>30% Cu) or "off-spec", use logistic regression. The logit link function maps any linear predictor to a probability between 0 and 1. Statistical Methods For Mineral Engineers

Elara was the site’s mineral processing engineer, but her secret weapon wasn't a froth flotation cell or a high-pressure grinding roll. It was a battered copy of Montgomery’s Introduction to Statistical Quality Control and a stubborn refusal to trust averages. “For the last six hours,” she said, pointing

If your data is autocorrelated (and it is), a simple t-test comparing "morning shift vs. night shift" is invalid. Use a dynamic linear model or ARIMA (Autoregressive Integrated Moving Average) . It’s not out of control statistically, but the

At the end of her shift, she walked back past the primary crusher. Gus had taped her run chart to his console. He wasn't touching the CSS. The belt scale’s one-minute readings were still noisy, but the variation had narrowed by half.