Mt. Holly has a "local" paper called the Belmont-Banner news. http://banner-news.com/
The paper reports news in the small towns with Belmont and Mt. Holly seemingly the main focus. In early 2015, the paper is now "free" and you can also buy a subscription to have it delivered. It's a weekly publication.
There are also two large daily papers that cover Mt. Holly news: The Charlotte Observer and the Gaston Gazette.
Information for the new Mt. Holly resident