To think living within 300m of a quarry will impact our quality of life?

[pickledplumjam]

We've seen the perfect house but it's within 300m of a quarry. Does anyone have any experience of how bad the noise will be?

You need to give a few more details... Like what sort of quarry. If it's a (for example) aggregate quarry then the permitted take of material (in tonnes) is likely to be high, and blasting will probably be involved.
If it's building stone to supply a local market then this can be done without blasting.

Id also speak to the local county council (as mineral and waste planning body) and ask about operating hours, permitted take of material and number of years left on the quarry planning permission. You'll also need to consider the traffic implications; if it's an aggregate quarry there's likely to be a number of large lorries rumbling in and out of the site although some sites have dedicated train lines.

Also consider what will happen when the quarry closes. There may be an intention to use the excavated space for landfill.

You should be able to see future direction of the site in the county council's Local Plan (sometimes called a Core Strategy). So this might also be with a look.
If you are looking in a county with am active mineral industry like Somerset that quarry will likely be there for the next few decades

It is absolutely not anyone’s “perfect” house I’m afraid.

It's sand and limestone that are being taken out of the quarry. It operates weekdays 6am-7pm. It will operate for another 20 years. The sand doesn't seem to be an issue but they use huge machines to cut the slabs of limestone and surely those make a big noise?

Very unlikely that it will be used for a landfill. Most likely housing or leisure.

I live half a mile below a quarry. Never hear a sound from them. Years ago we used to hear the air raid siren when they we blasting but not heard that in years. They seem to be very good a noise control nowadays

Can you visit the area at random times just to get an idea of how loud it is?

I'd be concerned about dust as well as noise. Your DC might also hear 'industrial language'.

It depends what kind of quarry it is. We live fairly close to an aggregate quarry. We very rarely notice it tbh. Sometimes you can hear it and if the wind is blowing in the right direction it can smell but there are strict rules on what times they can do things and it's not a big or busy quarry anymore.
There are lots of questions you need to ask about the quarry before you can make a decision.

"Your DC might also hear 'industrial language"

What's that? "Dig faster Dave, faster"?

Here it is.

www.oxfordmail.co.uk/news/16997437.shellingford-quarry-near-stanford-set-double-size/

I’d be worried about subsidence.

@LadyTiredWinterBottom2

Very unlikely that it will be used for a landfill. Most likely housing or leisure.

If housing then they will have to fill it first and then allow years for it to settle.

If leisure it will be a lake.