SAO PAULO - Manabi Holding SA, a Brazilian mining and logistics company, has proposed to inject about 400 million reais ($100 million) into Log-In Logística Intermodal SA , in exchange for a stake between 60 percent and 70 percent, according to a source with direct knowledge of the plan. According to the source, who requested anonymity to speak freely about the issue, the proposal is non-binding and subject to modification. Press representatives for Manabi and Log-In, a cargo ship and port operator, did not immediately comment. Manabi operates iron ore mines in the middle of the rich-mineral producing state of Minas Gerais, in southeast Brazil, and is trying to build a 511 kilometer (317 mile) iron ore pipeline and a private port terminal in the neighboring state of Espírito Santo. The proposal comes a week after Log-in hired investment bank Moelis & Co to advise on the refinancing of 1.9 billion reais of bank loans, three sources with direct knowledge of the situation said. The debt refinancing and the search for an investor to provide fresh capital to Log-In are being conducted at the same time, the sources added. Companies in Brazil - struggling with the country’s deepest recession in a quarter century, a surge in borrowing costs and a currency slump - are ramping up demand for advisory services on debt restructuring. A newfound caution of private sector lenders has made it harder for companies such as Log-In to refinance existing loans or make new ones. ($1 = 3.9660 Brazilian reais)