Caledonia Mining Corporation Plc: Increases in mineral resources and mineral reserves estimates at Blanket Mine, publication of Annual Report on Form 20-F and notice of a shareholder webinar ST HELIER, Jersey, May 15, 2024 (GLOBE NEWSWIRE) --  following the announcements of encouraging drilling results at Blanket Mine in Zimbabwe ("Blanket") on July 10, 2023 and January 30, 2024,...