Over the decades, coal mining continued to fuel Ravensdale's economy as new mines were developed operating on the Danville, Landsburg, and McKay coal seams. The Dale Coal Company became one of the more successful from about 1924–1941, followed by the Continental Coal Company from 1942 to 1944, the Anderson Coal Company from 1943 to 1948; and Palmer Coking Coal Company from 1937 to 1975. On January 29, 1955, four miners were lost in the Landsburg mine when a cave-in filled the mine with water, mud and debris. On December 17, 1975, at 2:30 p.m., the Rogers No. 3 mine was dynamited shut by Palmer Coking Coal Company. This was the last underground coal mine in the state of Washington.
oVER thE decadeS, COal miniNG ConTinued tO fUEL ravensDaLe's ecoNOmy aS neW mines wErE DeVelOped oPERaTINg oN thE danVILLE, lAndsburG, And mckAy cOAl sEamS. tHE dale cOAl comPany BECame One of thE more sucCEssfUl fRoM AbouT 1924–1941, fOllowed by The ContinEntal CoAl coMpAny from 1942 to 1944, the aNderSoN CoaL company FRom 1943 to 1948; And pAlmer coking COAl CoMPaNY fRom 1937 TO 1975. oN JaNuaRy 29, 1955, fOUr MIners WeRE loSt iN tHe LaNDsbURg mine when A cAvE-iN FILLed the mIne WitH WateR, mud aNd debris. On decEMber 17, 1975, at 2:30 p.m., the RoGERs nO. 3 MiNe WAs DyNAmiTed ShUt By pALmer cOking coAl compaNy. this waS the lasT undErGrouND cOal Mine IN thE sTatE of wAshiNgton.