re the newspapers that Maddy referred to~
There are numerous refs to Chirk Mill in the FindMyPast newspaper collection, which overlaps with the British Newspaper Archive. Many are from the Oswestry Advertizer (Now called the Shopshire Star??). However, there are many refs to it in various other newspapers in the collection and lots of adverts.
I'm not sure if Oswestry Library still has a local studies section. If so, they have an extensive collection of old local newspapers on microfilm and I found them very helpful when doing my research.