I'm not feeling the ballast theory. I'm also not feeling the "didn't pass QC so it was dumped overboard" either. I don't think bad castings would have made it out of the furnace, and even if they did get to the boat, it's not likely they would have left land. If it did get on the ship, it's not the captains job to QC the freight and dump what he didn't like overboard.
They could be scrap pieces that were being transported to a forge to be reclaimed but that doesn't explain why they'd be in the river.
This is a real mystery.
Jerseyman, do you know if any journals exist of any of the iron transporting ships that plied the waters of the Mullica?
Ben:
I have copies of logs and journals from flatboat operators—including one that regularly navigated Big Timber Creek—but I have not seen any records related to moving iron on the Mullica. A pity, to be sure!
I tend to agree with you, Ben, and I suspect that a portion of a casting shipment may have accidently dropped overboard during the loading process. I well remember back in the 1970s when the county replaced the Route 541 bridge over the Rancocas Creek in Lumberton. The town of Lumberton served as the headwaters shipping port for many of the South Jersey ironworks and they all maintained landing lots and wharves along the Rancocas there. When the divers went into the creek to conduct work on the new bridge footings, they brought up ingot after ingot of pig iron with the names of the various furnaces cast into the top of the pig. Atsion, Batsto, Ætna, and many others were represented in these pieces of iron. During the movement of the pigs from the wagons to the waiting vessels, invariably some would drop overboard and no one bothered with an attempt to retrieve the lost product. The same may apply here. Whether it was a lack of the technology necessary to pull the castings from the river or just a lack of gumption, if it dropped overboard it appears to have remained in the river.
The ironmaster would assess the casting quality right at the furnace and if a casting did not measure up, it went back into the crucible for remelting and reuse.
I’m not sure we will ever know the whole story with full certainty, but I suspect there may be some additional castings nearby.
Nothing like another mystery to keep the juices flowing!!
Best regards,
Jerseyman