There has been some very foolish decisions made in my opinion....

There has been some very foolish decisions made in my opinion. Shutting down FeSi furnaces for nearly 2 years for conversion to silicon metal was an expensive exercise, it would've been far cheaper to keep the FeSi furnaces operating especially when the price shot up to US$4000/tonne. It would've been far better to build 2 x new 33MVA silicon metal furnaces and not spend time and money doing conversions.
It is in hindsight but I had questioned OMH management about the FeSi to Mn alloy furnaces conversions and they thought the Mn alloys would make more than FeSi, however profit /furnace is now lower.

I don't know whether many realise but since this debacle OMH now longer states the earnings for the separate alloys.
Previously OMH would state the sales income and quantity for each segment ie
"FeSi volumes traded in 1H 2021 were 58,324 tonnes, with a total revenue contribution of approximately A$103.8 million (1H 2020: 80,538 tonnes with a revenue contribution of A$128.9 million). "
It was possible to calculate the selling price FeSi ie $103.8m/58,324 tonnes = A$1,779.71/t
Also H1 2020 $128.9m / 80,538 tonnes = A$1,600 /t
For manganese alloys
"
A total of 141,693 tonnes of manganese alloys were traded in 1H 2021 (with a revenue contribution of approximately A$190.3 million) as compared to 108,914 tonnes of manganese alloys traded in 1H 2020 (with a revenue contribution of approximately A$151.8 million)."

For manganese alloys A$190.3m / 141,693 t = A$1,343/ tonne
Also H1 A$151.8 m / 108,914 t = A$1,393/tonne

NOW OMH just lumps everything together to make it opaque as possible.
OMH now talks about production Qty , NOT SALES QTY

FINANCIAL REPORT FY2023
"The smelting segment recorded revenue of US$388.8 million for FY2023 as compared to US$648.7 million for FY2022. The decrease in revenue was mainly due to lower average prices of ferroalloys sold in FY2023. The Group produced 139,529 tonnes, 294,432 tonnes and 154,273 tonnes of FeSi, manganese alloys and manganese sinter ore respectively in FY2023 (FY2022: 140,355 tonnes, 216,813 tonnes and 112,711 tonnes of FeSi, manganese alloys and manganese sinter ore respectively).


FINANCIAL REPORT H1 2023

The smelting segment recorded revenue of US$202.0 million for 1H 2023 as compared to US$370.6 million for 1H 2022. The decrease in revenue was mainly due to lower average prices for ferroalloy sales in 1H 2023. The Group produced 59,598 tonnes, 122,927 tonnes and 72,342 tonnes of FeSi, manganese alloys and manganese sinter ore respectively in 1H 2023 (1H 2022: 68,929 tonnes, 121,307 tonnes and 56,093 tonnes of FeSi, manganese alloys and manganese sinter ore respectively).


Impossible to calculate price received per tonne, no separation of FeSi and Mn alloys and the volumes given are production not sales.


There is no way for investors to ascertain OMH’s performance

You can get a partial answer by looking up the actual SALES ie FeSi 135,545 tonnes and Mn alloys 290,770 tonnes.
Total alloys sold 426,315 for US$388.8 million = an average of US$912/tonne.
If we use the sales qty and the lowest price for the year
ie FeSi 135,545 t x US$1,285 = US$174.1 m
Mn alloys 290,770 t x US$900 = US$261.7 m
TOTAL sales of alloys US$435.8 million.
If OMH received US$388.8 m but the lowest price for the year was US$435.8 m where did the balance go? ie US$47 million
Therefore OMH got 10% less than the lowest price for the year.
Its no wonder that OMH management are not telling,