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I contest the need for cleanup of the lead. According to Wikipedia:Manual_of_Style/Lead_section, the lead serves as an introduction to the article and a summary of its most important contents. The lead should stand on its own as a concise overview of the article's topic. Given the length of the article, I would suggest that the lead is a little short, rather than too long. Bob1960evens (talk) 17:10, 7 September 2020 (UTC)[reply]
Reading it again, I have changed the tag to {{lead too short}}.
The current lead section of this article is: a half sentence explaining what the subject is ('a slatequarry'), a very short description of its location ('northeast of Portmadog in North Wales'), followed by two paragraphs describing its history, and nothing on at all on the other sections. My thoughts were that the summary of the history section was of excessive reletive length, but this is actually a problem with the other parts. WT79(speak to me | editing patterns | what I been doing)21:07, 18 September 2020 (UTC)[reply]