As far as I know, only the coinbase transactions in the first 6050 blocks were locked/frozen. Not sure if sending directly to the addresses inside those blocks works.
In the Ixcoin wallet, go to Help tab > debug window > console and type "help" you can see all the commands available. One of those commands is fundmining. That's the feature to add IXCoins to the mining fund.
Hi iRaf
I tried to do this through the console but it doesnt seem to be working but I am probably doing an incorrect input. I have used console before to import priv key and thought it would work the same but does not seem to work with this command for me at least.
20:47:41

fundmining amount
Send an amount to the mining fund.
Arguments:
1. "amount" (numeric or string, required) The amount in BTC to send. eg 0.1
Result:
"transactionid" (string) The transaction id.
Examples:
> ixcoin-cli fundmining 0.1
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "fundmining", "params": [0.1] }' -H 'content-type: text/plain;' http://127.0.0.1:8332/
(code -1)20:50:58

"amount" (xhL4xk9pxbs2HS1d2MVHEAd7PXYv9gpBMh) .01
20:50:58

Method not found (code -32601)
20:51:32

"amount" (xhL4xk9pxbs2HS1d2MVHEAd7PXYv9gpBMh).01
20:51:32

Method not found (code -32601)
20:52:05

amountxhL4xk9pxbs2HS1d2MVHEAd7PXYv9gpBMh.01
20:52:05

Method not found (code -32601)
20:52:39

amount xhL4xk9pxbs2HS1d2MVHEAd7PXYv9gpBMh .01
20:52:39

Method not found (code -32601)
20:52:50

amount xhL4xk9pxbs2HS1d2MVHEAd7PXYv9gpBMh .01ixc
20:52:50

Method not found (code -32601)
20:53:00

20:47:41

fundmining
20:47:41

fundmining amount
Send an amount to the mining fund.
Arguments:
1. "amount" (numeric or string, required) The amount in BTC to send. eg 0.1
Result:
"transactionid" (string) The transaction id.
Examples:
> ixcoin-cli fundmining 0.1
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "fundmining", "params": [0.1] }' -H 'content-type: text/plain;'
http://127.0.0.1:8332/ (code -1)
20:50:58

"amount" (xhL4xk9pxbs2HS1d2MVHEAd7PXYv9gpBMh) .01
20:50:58

Method not found (code -32601)
20:51:32

"amount" (xhL4xk9pxbs2HS1d2MVHEAd7PXYv9gpBMh).01
20:51:32

Method not found (code -32601)
20:52:05

amountxhL4xk9pxbs2HS1d2MVHEAd7PXYv9gpBMh.01
20:52:05

Method not found (code -32601)
20:52:39

amount xhL4xk9pxbs2HS1d2MVHEAd7PXYv9gpBMh .01
20:52:39

Method not found (code -32601)
20:52:50

amount xhL4xk9pxbs2HS1d2MVHEAd7PXYv9gpBMh .01ixc
20:52:50

Method not found (code -32601)
20:53:00

amount xhL4xk9pxbs2HS1d2MVHEAd7PXYv9gpBMh .01 ixc
20:53:00

Method not found (code -32601)
20:53:06

amount xhL4xk9pxbs2HS1d2MVHEAd7PXYv9gpBMh .01 ixcoin
20:53:06

Method not found (code -32601)
20:53:18

amount xhL4xk9pxbs2HS1d2MVHEAd7PXYv9gpBMh.01ixcoin
20:53:18

Method not found (code -32601)
20:54:15

1. "amount" (xhL4xk9pxbs2HS1d2MVHEAd7PXYv9gpBMh)0.1
20:54:15

Method not found (code -32601)
20:59:01

amount 878744 0.1
20:59:01

Method not found (code -32601)
20:59:58

"amount" (01) 0.1
20:59:58

Method not found (code -32601)
21:00:09

0.1
21:00:09

Method not found (code -32601)
21:00:37

ixcoin-cli fundmining 0.1
21:00:37

Method not found (code -32601)