Your supplier says they own a quarry. How do you check?
Owning a quarry, holding a block-supply contract and buying blocks at the pit gate are three very different suppliers. The point of checking is not to catch a liar — it is to judge supply risk and colour-batch control.
Why is this claim worth checking at all?
Because at least three different businesses say it: the holder of the actual mining licence, a company with a block-supply or offtake contract at that pit, and a factory or trader that simply buys blocks there every week. Their quotations can look identical, but supply risk, colour-batch control and who carries the loss when something goes wrong are completely different. You are sorting suppliers into those three groups, not hunting for fraud.
Which three questions separate them?
First, how many cubic metres of block does this pit produce per month, and how many saws are cutting now. Second, are the blocks sold to other factories, or cut entirely in-house. Third, how are colour variations between batches graded, and how are reference samples kept. A real quarry operator can answer output and grading rules. Someone who can only say we have many quarries or we have whatever you need is usually a middleman.
What should you read on the mining licence?
Four things: whether the licensee is the same legal entity you are talking to, whether the licensed mineral is granite, which county the mining area sits in, and how many years remain. The last one is the most overlooked — a licence close to expiry means future supply has a question mark, which matters for long projects. If they say it is being processed or renewed, treat them as a trader until they show the document.
If you cannot visit, how do you verify a quarry on video?
Ask for one continuous take: start at the pit signboard, walk to the block yard, the loaders and the trucks, then through into the factory, with no cuts. Edited clips prove those places exist; they do not prove they are next to each other. Then ask them to hold up a board with today's date in shot. It costs nothing and filters out most suppliers who assemble footage from other people's material.
Does owning a quarry make a supplier more reliable?
Not automatically. A quarry owner controls colour batches and carries less supply risk, but processing capacity may be weaker, small orders may be refused, and your delivery date queues behind bigger customers. Factories and traders are more flexible, accept smaller orders and can consolidate containers, but batch consistency depends on their relationship with the pit. The real question is where your order sits in their priority list.
How do you put the finding into the contract?
Write same pit, same colour code into the specification instead of only a trade name and a G number. Agree that colour across shipments is judged against the first approved sample, and state what happens if it falls outside. Add what the alternative is if the pit stops production or is shut for inspection, and how much notice you get. Those three sentences do more work than any verbal promise, because you can put them on the table when a problem appears.