The guerrilla base in southern Shensi was founded by a part of the main force of the Central Plains Liberation Army and included Lushih and Hsichuan in western Honan and Lonan and Shanyang in southern Shensi.
My presumption is that this same mechanism was at work in two counties in Shaanxi Province, as recorded in county gazetteers. In Qianyang County, during the Cleansing of Class Ranks campaign of 1968-69 that put to an end the Cultural Revolution fighting, 152 households were newly labeled as landlord and 130 as rich peasant, while in Shanyang County over a thousand households were re-labeled as landlords or rich peasants.
2008 July 23, Beijing Newsroom, “Vanadium mine leak taints rivers in northwest China”, in Guo Shipeng, Nick Macfie, editors, Reuters, archived from the original on 26 August 2022, Environment:
Sludge spewed into the Shuanghe River and Donghe River in Shaanxi province’s Shanyang county when the spillway collapsed early on Tuesday, Xinhua said.[…] In April, ore tailings from another vanadium mine in Shanyang county polluted and literally blackened three rivers, state media reported at the time.