Steel furnaces do have liners made of similar or the same materials. What kinds of materials are used to make those liners depends on the temperatures that the process needs to withstand. There are special mineral properties in some silica and clay deposits that can be quite rare or at the very least limited.
Sure you can find just sand and gravel at much lower prices. I would suspect that the sand and gravel valueseeker666 listed prices for in Germany were almost as basic as you can get. It costs money to separate and blend minerals in spec ratios. Even those minerals that do form together. The mark up on unfinished aggregate is obviously not going to be that great. Sprinkle (for instance) some Magnesium Oxide in the sand though and the price jumps. Magnesium Oxide, which is totally off base here I know, sells for $3000 to $5000 a ton from what I have read. I am just using it as an extreme skyward example to the ground base example given in Germany aggregate.
I went and watched the pit videos again when TTR pointed out one of the big players in the recent PR. Rogue mentions an automated machine that can separate I think up to 10 products at once, one of which is a $40 product. No mention of the other minerals.
What would be nice to know is what are the more specifics about the "blended aggregate" we will be contracted to deliver. Silica, clay, limestone, coal, concrete and various other minerals are used in refractory materials and per the video, Murphy is 820 acres and was only working from 5 or so acres at the time of that video. Combine that with the other pit, strip coal mines and limestone deposits and this has much bigger and profitable potential than shipping sand to backfill levees, gravel to backfill potholes or backfill dirt to level building foundations.
The last PR was pretty good information and just like the pit, there are 820 questions of which we have the answer to 5. LOL
We have plenty of reasons to be bullishly here. Anyone speek polish?
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