Read my previous post. And check on Africas production while you're at it. Who says it has to be all at once? Even just 2mm metric tons a year sold adds at least $10mm profit to the bottom line.
One major point you are missing. There are MANY smallar cement production facilities around the country and world. There are five plants in St Petersburg alone. According the the US Portland Assn. The US alone consumed 138.2MM Tons of portland products last year. That is far more than a few mega plants could produce. And again you are looking at finished product SLJB is providing RAW product to the plants.