diff --git a/logger/types.go b/logger/types.go
index 7ab4a2b8c2..86408620ed 100644
--- a/logger/types.go
+++ b/logger/types.go
@@ -1,6 +1,7 @@
 package logger
 
 import (
+	"math/big"
 	"time"
 )
 
@@ -53,10 +54,10 @@ func (l *P2PDisconnected) EventName() string {
 }
 
 type EthMinerNewBlock struct {
-	BlockHash     string `json:"block_hash"`
-	BlockNumber   int    `json:"block_number"`
-	ChainHeadHash string `json:"chain_head_hash"`
-	BlockPrevHash string `json:"block_prev_hash"`
+	BlockHash     string   `json:"block_hash"`
+	BlockNumber   *big.Int `json:"block_number"`
+	ChainHeadHash string   `json:"chain_head_hash"`
+	BlockPrevHash string   `json:"block_prev_hash"`
 	LogEvent
 }
 
diff --git a/miner/worker.go b/miner/worker.go
index 4f0909302c..6f43a9c398 100644
--- a/miner/worker.go
+++ b/miner/worker.go
@@ -10,11 +10,14 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/event"
+	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/pow"
 	"github.com/ethereum/go-ethereum/state"
 	"gopkg.in/fatih/set.v0"
 )
 
+var jsonlogger = logger.NewJsonLogger()
+
 type environment struct {
 	totalUsedGas *big.Int
 	state        *state.StateDB
@@ -141,7 +144,12 @@ func (self *worker) wait() {
 			block := self.current.block
 			if block.Number().Uint64() == work.Number && block.Nonce() == nil {
 				self.current.block.Header().Nonce = work.Nonce
-
+				jsonlogger.LogJson(&logger.EthMinerNewBlock{
+					BlockHash:     ethutil.Bytes2Hex(block.Hash()),
+					BlockNumber:   block.Number(),
+					ChainHeadHash: ethutil.Bytes2Hex(block.ParentHeaderHash),
+					BlockPrevHash: ethutil.Bytes2Hex(block.ParentHeaderHash),
+				})
 				if err := self.chain.InsertChain(types.Blocks{self.current.block}); err == nil {
 					self.mux.Post(core.NewMinedBlockEvent{self.current.block})
 				} else {